Active location

Pen y Fan, Powys

51.88°N, 3.44°W · ~848m · 06:32 – 19:51

Updated 12:28

Temp

11°C

↑ 0.5 / 1hr

Wind

9.8

↓ 0.7 / 1hr

Condition

Mostly cloudy

Score

6.6

Good


Time
Condition
Precip mm
Precip %
Temp & Wind
Temp °C
Feels °C
Direction
Wind mph
Gust mph
Detail
Humidity %
Pressure
Vis km
UV Index
CAPE J/kg
Score

Sat 5 Sep												Sun 6 Sep																								Mon 7 Sep																								Tue 8 Sep																								Wed 9 Sep																								Thu 10 Sep																								Fri 11 Sep																								Sat 12 Sep
12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00	00:00

-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.2	1	2.2	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.4	0.4	0.1	0.1	0.3	-	0.1	-	-	-	-	-	-	-	-	-	-	-	-	-	0.3	0.3	0.3	0.6	0.6	0.6	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.1	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.2	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
10%	15%	15%	10%	0%	5%	5%	5%	10%	10%	5%	10%	10%	15%	10%	10%	30%	90%	100%	100%	70%	25%	10%	10%	5%	0%	5%	5%	5%	5%	5%	15%	20%	30%	35%	65%	95%	95%	95%	95%	95%	55%	95%	40%	20%	25%	10%	10%	10%	10%	10%	10%	15%	10%	10%	25%	70%	80%	85%	85%	90%	90%	50%	15%	10%	10%	5%	5%	0%	10%	5%	5%	10%	5%	20%	20%	20%	15%	10%	5%	15%	25%	25%	20%	20%	20%	15%	15%	15%	15%	20%	20%	15%	15%	10%	10%	15%	20%	20%	20%	20%	20%	20%	20%	25%	35%	35%	35%	35%	35%	35%	30%	30%	30%	30%	30%	30%	25%	20%	15%	15%	5%	15%	10%	20%	25%	30%	35%	35%	35%	40%	90%	90%	90%	90%	90%	85%	85%	85%	85%	40%	35%	35%	30%	30%	30%	25%	20%	10%	10%	5%	5%	5%	15%	20%	20%	25%

11°	11°	12°	12°	12°	12°	11°	10°	9°	9°	9°	10°	10°	10°	10°	10°	10°	9°	9°	9°	9°	10°	11°	12°	14°	15°	16°	16°	17°	17°	16°	15°	13°	13°	13°	13°	13°	13°	13°	13°	13°	12°	11°	9°	9°	9°	10°	10°	11°	12°	12°	13°	13°	13°	12°	11°	11°	11°	10°	9°	9°	8°	8°	8°	8°	7°	6°	6°	7°	8°	9°	10°	10°	11°	11°	10°	10°	10°	9°	8°	8°	8°	7°	7°	7°	7°	6°	6°	5°	5°	5°	5°	6°	8°	9°	9°	10°	10°	10°	10°	10°	9°	9°	8°	7°	6°	5°	5°	6°	7°	7°	7°	6°	6°	6°	7°	7°	8°	9°	10°	11°	11°	12°	12°	13°	12°	12°	11°	11°	10°	10°	11°	11°	11°	11°	11°	11°	11°	11°	11°	11°	11°	12°	13°	13°	13°	13°	12°	12°	11°	11°	10°	9°	9°	8°	8°	7°
7°	8°	9°	9°	9°	9°	8°	8°	7°	7°	6°	7°	7°	7°	6°	5°	5°	5°	5°	6°	6°	7°	6°	8°	11°	12°	12°	12°	13°	13°	13°	13°	11°	11°	10°	11°	11°	11°	10°	10°	10°	9°	9°	6°	5°	5°	6°	6°	7°	7°	7°	8°	8°	8°	8°	7°	7°	7°	6°	6°	5°	5°	5°	5°	5°	4°	3°	3°	3°	4°	5°	5°	5°	5°	5°	5°	5°	5°	5°	5°	4°	4°	4°	4°	4°	4°	3°	3°	2°	2°	2°	2°	3°	4°	5°	5°	5°	5°	6°	6°	6°	6°	5°	5°	5°	4°	3°	4°	5°	5°	5°	5°	5°	5°	5°	5°	6°	7°	8°	8°	8°	8°	8°	9°	10°	9°	9°	9°	8°	8°	8°	9°	9°	9°	9°	9°	9°	9°	9°	9°	9°	9°	10°	10°	10°	10°	10°	10°	10°	9°	9°	9°	8°	8°	7°	6°	6°
W	W	W	WSW	WSW	WSW	SW	SW	SW	SW	SSW	SSW	SSW	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	SW	SSW	SSW	SSW	SW	SW	SW	SW	WSW	SW	W	W	W	W	W	W	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	SW	SW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	W	W	W	W	W	W	WNW	WNW	W	W	W	W	W	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	W	W	W	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	W	W	WSW	SW	SSW	SSW	SSW	S	S	S	S	SSE	SSE	S	S	S	S	SSW	SSW	SSW	SSW	SSW	SSW	S	S	S	S	S	S	S	S	SSW	SSW	SW	WSW	WSW	W	W	W	W	W	W	W	WNW	WNW	WNW	NW	NW	NW	WNW	W	WSW	SW	SSW
10	9	8	9	9	10	9	6	7	6	7	7	8	8	13	15	16	16	17	12	15	14	20	17	15	17	18	19	17	15	14	10	11	13	16	14	12	13	15	13	15	12	13	12	14	15	16	16	16	16	17	18	19	18	17	15	15	15	15	14	12	11	10	9	9	9	8	9	10	12	13	14	15	16	16	16	15	15	13	12	12	11	10	10	9	8	8	8	8	8	8	9	10	12	13	13	13	13	13	12	11	10	7	5	4	2	2	2	2	3	3	3	3	2	2	2	2	2	3	6	9	11	12	11	11	11	10	10	10	11	11	9	9	9	9	9	9	9	9	9	9	10	11	12	12	12	11	10	8	6	5	4	3	3	3	3	3
19	18	16	17	16	18	17	13	13	12	14	14	15	15	26	29	32	31	33	24	30	28	37	32	28	32	33	34	32	29	27	20	21	24	31	27	24	24	28	26	29	24	26	24	26	28	31	30	31	30	30	33	35	33	30	28	28	28	28	26	23	20	18	17	16	15	15	16	18	21	25	27	29	30	30	30	29	27	24	22	21	20	19	18	16	15	15	15	15	15	15	17	19	22	24	25	25	25	24	24	22	18	14	10	7	5	4	3	4	4	4	4	4	4	3	3	4	5	8	12	17	20	21	21	21	20	19	18	18	19	20	16	16	16	16	16	16	16	16	16	17	19	20	21	22	22	21	18	15	13	10	8	6	5	5	4	4

74	72	70	69	66	66	70	73	79	78	77	75	73	75	78	81	83	90	89	97	94	92	86	82	79	75	73	71	67	68	73	79	89	93	98	99	99	99	99	99	99	98	100	98	96	91	85	78	75	72	68	66	66	69	74	79	83	88	91	93	94	94	93	91	90	90	89	88	85	82	77	71	63	59	60	64	68	73	78	83	87	90	92	93	93	93	92	91	90	91	94	94	91	85	80	75	70	66	64	64	65	66	68	72	79	87	93	93	91	89	90	92	93	94	95	95	94	92	89	86	82	79	76	74	74	79	86	92	94	94	94	95	95	95	95	96	96	96	96	95	94	92	89	87	85	84	83	83	83	84	84	85	86	88	90	92	94
926	926	926	926	926	926	926	926	926	926	926	926	926	926	925	924	924	923	923	923	923	923	922	923	922	922	922	921	921	920	920	920	919	919	919	919	919	919	919	918	918	919	919	919	919	919	919	919	919	919	919	919	919	919	918	918	917	917	916	915	915	914	914	914	913	913	912	912	912	913	913	913	914	914	914	914	913	913	913	913	914	914	914	914	915	915	915	915	915	915	916	916	917	918	918	919	919	919	919	919	919	919	918	918	918	917	917	917	917	917	917	916	916	916	916	916	917	917	918	918	918	918	918	918	918	917	917	916	916	916	916	915	915	915	915	915	915	915	916	916	916	917	917	918	919	919	919	919	919	920	920	920	920	920	920	920	920
35.3	37.5	35.8	35.3	30	34.2	35.8	35.9	31.4	32.7	34.6	36.1	35.2	32.5	28.7	24.8	24.6	14.7	17	10.8	21.6	21.3	22.6	23.4	23	24.2	25.4	24.9	25	28.4	28.7	24.8	21.8	18.4	8.7	2.5	2.5	2	6.6	6.7	4.4	13.8	1.9	16.3	20.6	28.7	34.1	32.6	28.9	26.3	22.9	23.2	23.5	22	20.5	19	13.8	8.6	3.3	7.9	12.5	17.1	17.9	18.7	19.5	20.1	20.7	21.3	22.2	23	23.9	24.3	24.7	25.1	23.6	22	20.5	19.8	19.1	18.4	17.2	16.1	14.9	16	17.1	18.2	18.9	19.5	20.2	18.9	17.7	16.4	17.4	18.3	19.3	18.3	17.3	16.3	19.4	22.4	25.4	25.2	25.1	24.9	22.5	20	17.6	18.6	19.6	20.7	19.8	18.9	18	17.6	17.1	16.7	14.1	11.6	9.1	12.9	16.7	20.4	17.5	14.5	11.6	12.5	13.4	14.4	11.7	9.1	6.5	6.3	6	5.8	7.6	9.4	11.2	13	14.8	16.7	15	13.4	11.8	10.1	8.5	6.9	9.5	12.2	14.8	17.5	20.1	22.7	21.7	20.7	19.7	18.7	17.7
2.7	2.8	2.5	2.5	2	0.8	0.3	-	-	-	-	-	-	-	-	-	-	-	-	-	0.2	0.4	1.5	2.5	3.4	4.1	3.5	2.9	1.9	0.9	0.3	-	-	-	-	-	-	-	-	-	-	-	-	-	0.2	0.7	1.7	1.7	2.5	2.9	2.8	2.5	2.1	1.6	1	0.4	-	-	-	-	-	-	-	-	-	-	-	0.2	1.2	2.1	2.9	3.4	3.6	3.5	3	2.4	1.9	1.8	1.4	0.6	-	-	-	-	-	-	-	-	-	-	-	0.2	1.2	2	2.5	2.8	3	2.9	2.7	2.4	2	1.4	0.9	0.3	-	-	-	-	-	-	-	-	-	-	-	0.1	0.7	1.3	1.9	2.6	3.4	3.7	3.5	2.8	2.1	1.5	0.9	0.3	-	-	-	-	-	-	-	-	-	-	-	0.1	0.6	1.2	1.7	2.2	2.4	2.6	2.8	3	2.8	2.3	1.5	0.5	-	-	-	-	-
20	30	30	30	20	20	10	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	10	10	10	10	10	10	0	0	0	0	0	20	20	40	10	20	20	10	10	10	10	10	20	15	20	20	30	50	60	60	60	60	60	60	60	40	20	0	0	0	0	0	0	0	20	50	70	90	100	100	100	90	70	50	20	0	0	0	0	0	0	0	0	0	0	0	0	0	20	60	80	80	80	70	60	60	50	40	20	10	0	0	0	0	0	0	0	0	0	0	0	0	10	30	50	60	60	60	60	60	60	50	30	10	0	0	0	0	0	0	0	0	0	0	0	0	10	20	40	50	70	70	70	50	40	20	10	0	0	0	0	0	0
6.4	5.4	7.0	6.9	6.9	6.5	6.9	6.5	6.3	6.7	7.5	7.3	5.9	5.9	3.7	3.0	2.5	2.5	1.4	2.6	2.9	3.4	1.0	2.2	4.3	3.5	2.0	1.7	2.2	3.0	3.4	4.9	4.8	4.0	2.6	3.5	3.9	3.8	3.1	3.7	2.9	4.2	3.7	5.4	4.8	3.2	2.6	2.6	2.6	2.7	2.6	1.9	1.5	1.9	2.6	3.1	3.0	2.9	2.9	3.2	3.9	4.5	6.5	6.7	6.9	7.0	7.1	7.0	6.5	5.7	5.1	4.6	4.2	3.9	3.9	2.8	3.0	4.6	5.1	5.5	5.8	6.0	6.3	6.6	6.8	7.1	7.2	7.3	7.3	7.2	7.1	6.8	6.3	5.7	5.2	5.0	3.8	3.9	4.0	4.2	4.5	5.3	6.2	7.0	7.6	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	8.8	6.8	6.9	6.0	5.7	5.8	4.8	4.9	5.2	5.3	5.2	5.0	4.9	5.6	5.6	5.7	5.7	5.7	5.7	5.7	5.6	5.5	5.5	5.2	4.8	4.5	4.4	4.4	4.8	6.5	7.1	7.7	8.3	8.7	10.0	10.0	10.0	10.0	8.8

Best Activity Window

WeatherDuck score

Day average: 6.6/10

Best window: 14:00-17:00 · Avg 6.9

What this shows

The selected day from 06:00 to 21:00, scored from 0-10. The top line gives the day average and strongest window; the bars show how conditions rise and fall through that activity window. WeatherDuck score — Wind up to 5 mph (matters a lot) · Rain none at all (matters a fair bit) · Sky At least Mostly cloudy (matters a fair bit).

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These factors shape your score — set a comfy range for each, and how much it matters. Add more from the tray, or remove ones you don't care about. The bars update instantly.

Wind

Comfy range up to 5 mph

How much it matters

matters a lot

Rain

Comfy range none at all

How much it matters

matters a fair bit

Sky

Comfy range At least Mostly cloudy

How much it matters

matters a fair bit

Temperature

Comfy range 0 – 25°C

How much it matters

matters a fair bit

Time of day

Comfy range any time of day

How much it matters

matters a fair bit

Comfy range any UV level

How much it matters

matters a fair bit

Wind direction

Comfy range any direction

How much it matters

matters a fair bit

Visibility

Comfy range at least 5 km

How much it matters

matters a fair bit

Not counted — tap to add

Overcast

12° / 7° · Today · Sat 5

Dry through the day with little or no measurable rain. Westerly winds averaging around 9 mph with peaks near 12 mph, gusting to 24 mph. Temperatures range from 7C to 12C with largely cloudy skies.

0.0 mm

Rain total

12 mph W

Wind max

gusts 24 mph

2.8

UV max

peak 13:00

Low

Pollen

Grass

Air quality

Fair

Very low

Thunder

CAPE 30

Atmosphere

Cloud avg 80%

Freezing level 3,490 mup to 4,100 m

Fog risk Low

Sun & Moon

06:32 / 19:51

Sun ↑↓

13 h 19 m

Daylight

23:42 / 17:14

Moon ↑↓

Waning Crescent

Moon phase

39% lit

Overcast

17° / 9° · Tomorrow · Sun 6

Spells of rain most likely in morning. Southerly winds averaging around 15 mph with peaks near 20 mph, gusting to 37 mph. Temperatures range from 9C to 17C, trending warmer later with largely cloudy skies. Watch for moderate uv in brighter breaks.

3.4 mm

Rain total

20 mph S

Wind max

gusts 37 mph

4.1

UV max

peak 13:00

Low

Pollen

Grass

Fair

Air quality

Very low

Thunder

CAPE 20

Atmosphere

Cloud avg 96%

Freezing level 3,680 mup to 4,100 m

Fog risk Low

Sun & Moon

06:33 / 19:49

Sun ↑↓

13 h 15 m

Daylight

-- / 17:59

Moon ↑↓

Waning Crescent

Moon phase

29% lit

Overcast

13° / 9° · Mon 7 Sep

Spells of rain most likely in afternoon / evening. West-southwesterly winds averaging around 15 mph with peaks near 19 mph, gusting to 35 mph. Temperatures range from 9C to 13C, turning cooler later with largely cloudy skies.

2.9 mm

Rain total

19 mph WSW

Wind max

gusts 35 mph

2.9

UV max

peak 13:00

Pollen

Air quality

Very low

Thunder

CAPE 60

Atmosphere

Cloud avg 96%

Freezing level 3,430 mup to 3,970 m

Fog risk Low

Sun & Moon

06:35 / 19:47

Sun ↑↓

13 h 11 m

Daylight

01:05 / 18:31

Moon ↑↓

Waning Crescent

Moon phase

20% lit

Mainly clear

11° / 6° · Tue 8 Sep

Patchy precipitation is possible, but coverage looks limited. Westerly winds averaging around 12 mph with peaks near 16 mph, gusting to 30 mph. Temperatures range from 6C to 11C with a mix of sun and cloud. Watch for moderate uv in brighter breaks.

1.2 mm

Rain total

16 mph W

Wind max

gusts 30 mph

3.6

UV max

peak 12:00

Pollen

Air quality

Very low

Thunder

CAPE 100

Atmosphere

Cloud avg 50%

Freezing level --

Fog risk Low

Sun & Moon

06:36 / 19:44

Sun ↑↓

13 h 7 m

Daylight

02:35 / 18:52

Moon ↑↓

Waning Crescent

Moon phase

12% lit

Overcast

10° / 5° · Wed 9 Sep

Dry through the day with little or no measurable rain. West-northwesterly winds averaging around 9 mph with peaks near 13 mph, gusting to 25 mph. Temperatures range from 5C to 10C with a mix of sun and cloud. Watch for moderate uv in brighter breaks.

0.0 mm

Rain total

13 mph WNW

Wind max

gusts 25 mph

UV max

peak 12:00

Pollen

Air quality

Very low

Thunder

CAPE 80

Atmosphere

Cloud avg 59%

Freezing level --

Fog risk Low

Sun & Moon

06:38 / 19:42

Sun ↑↓

13 h 3 m

Daylight

04:06 / 19:08

Moon ↑↓

Waning Crescent

Moon phase

6% lit

Overcast

13° / 6° · Thu 10 Sep

Dry through the day with little or no measurable rain. South-southwesterly winds averaging around 7 mph with peaks near 12 mph, gusting to 21 mph. Temperatures range from 6C to 13C, trending warmer later with largely cloudy skies. Watch for moderate uv in brighter breaks.

0.1 mm

Rain total

12 mph SSW

Wind max

gusts 21 mph

3.7

UV max

peak 13:00

Pollen

Air quality

Very low

Thunder

CAPE 60

Atmosphere

Cloud avg 94%

Freezing level --

Fog risk Low

Sun & Moon

06:40 / 19:40

Sun ↑↓

12 h 59 m

Daylight

05:32 / 19:21

Moon ↑↓

Waning Crescent

Moon phase

2% lit

Light drizzle

13° / 8° · Fri 11 Sep

Light showers most likely in morning. Westerly winds averaging around 8 mph with peaks near 12 mph, gusting to 22 mph. Temperatures range from 8C to 13C, turning cooler later with largely cloudy skies. Watch for moderate uv in brighter breaks.

1.4 mm

Rain total

12 mph W

Wind max

gusts 22 mph

UV max

peak 15:00

Pollen

Air quality

Very low

Thunder

CAPE 70

Atmosphere

Cloud avg 79%

Freezing level --

Fog risk Low

Sun & Moon

06:41 / 19:37

Sun ↑↓

12 h 56 m

Daylight

06:56 / 19:33

Moon ↑↓

New Moon

Moon phase

0% lit

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0 mm

Last 24 h

63.8 mm

Last 7 days

Measured at Storey Arms raingauge rain gauge, 3.2 km away

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Layer	Item	Material	Why
Base	Moisture-wicking top	Merino wool or synthetic; avoid cotton	A good standard choice in most conditions
Mid	Light fleece	Micro-fleece or lightweight synthetic; down OK today (dry forecast)	12°C with mild, windy insulation
Outer	Waterproof (in pack)	Lightweight packable shell because UK weather changes fast	Always carry because conditions shift quickly
Lower	Walking trousers	Quick-dry, stretch fabric	Dry conditions, comfortable walking
Feet	Walking boots	Standard boots, good grip on mixed terrain	Standard conditions
Extras	Hat, gloves, gaiters	Pack spare mid-layer, buff/neck gaiter	Cool on ridges, so extra warmth will be useful

Pack a backup. Keep one spare layer close.

Wear from the start 4 pieces

Keep in your pack 1 layer

Add before you go Weather protection

Tap an item to see why

Essential Recommended Guidance

Guidance based on the forecast, not professional safety advice. Always use your own judgement. BMC layering guide →

Inversion Outlook Bannau Brycheiniog & South Wales Valleys region

Unlikely

Saturday afternoon BEST

No clear window yet.

SAT AFTERNOON

No clear window

Unlikely

SUN MORNING

No clear window

Unlikely

Tap a period for detail

Key Factors

Temperature lid

Valley moisture

Layer contrast

Summit clarity

Wind speed

47%

Duration

No temperature inversion detected

Marginal moisture below

No moisture contrast, diffuse profile

Saturated above, no clear cap

Breezy, layer may not hold

No sustained favourable window

Create Free Account for 1 Alert

Example email alert

Brecon Very likely

A Very likely inversion is about 28 km from your chosen location — tomorrow, best window 6–9am.

See the best spot →

Email alerts sent up to 24h ahead.

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Cloud Inversion Heatmap

Atmospheric Profile · Brecon · 137 m

Region Anchor

Loading… Timeline

Surface Pressure

Humidity at Pressure Levels

Temperature at Pressure Levels

Golden Hour

Today

DARKNESS

DAYLIGHT

05:47

06:12

06:32 Sunrise

06:52

07:17

Golden Hour · 40 min

Be at your summit by 06:12

Allow time to set up before the light show begins.

Monthly Inversion Chance

Illustrative relative chance by season

Illustrative — typical UK pattern

~2 proper inversion days per year. Mostly late autumn to spring. Free accounts get one 24-hour alert; Premium alerts can warn you up to 48 hours ahead.

Cloud inversions explained

What is a cloud inversion near Pen y Fan, Powys?

A cloud inversion happens when cool, moist air becomes trapped in valleys beneath warmer air above. If the trapped moisture turns into fog or low cloud, the hills can rise through it into clearer air and sunshine. From a summit, the result can look like a wide sea of cloud with only the higher peaks visible.

The best chance near Pen y Fan, Powys is a calm, settled night with moist valley air, a warm lid above and clearer, drier air over the tops. The bands on this page, from Unlikely to Very likely, describe the strength of that overall signal rather than a percentage promise, so always check timing, estimated cloud height and wind before setting off.

How to read this page. The headline outlook covers the surrounding region. Key Factors and the Atmospheric Profile describe the nearest available atmospheric profile.

See the dedicated Pen y Fan cloud inversion page Read the full UK cloud inversion guide See how WeatherDuck forecasts inversions

Common questions

When are cloud inversions most likely near Pen y Fan?

Late October to early March, most often in the hours around dawn. They need a long, calm, clear night so cold air can pool in the valleys, which is why they are rare in summer.

How high do you need to climb to get above the cloud?

It depends on the cloud top, which most often sits between 200m and 800m. This page estimates the cloud top for each night, so check it against the height of the summit you have in mind.

How far ahead can a cloud inversion be forecast?

The signal usually firms up inside 48 hours. Beyond that the outlook tells you whether the pattern looks favourable rather than giving a firm call.

Does a Likely band mean an inversion is guaranteed?

No. The bands describe how strongly the ingredients line up, not a percentage chance, so always check the timing, estimated cloud height and wind before setting off.

Tonight's Stargazing

Very poor conditions Skies look closed in — best to wait it out.

Moon Waning Crescent 34%

Cloud Cover Overcast 93%

Moon Times Set 17:14 · Rise 23:42

Sky Clarity 28 km Clear

Lunar Day Day 23.6

Light Pollution View map ↓

Tonight's Aurora

Aurora & Solar Wind NOAA

3.0 Planetary Kp No Data

Solar wind data unavailable right now.

Nightly Outlook

Swipe or tap a day · cream arc = moon altitude · red dotted = horizon · orange = sun · green band = best stargazing window

Tonight

Waning Crescent · 34% illuminated

6 out of 100

60° 30° 0°

▲Moonrise 23:42

☀ Sunset 19:51

☀ Sunrise 06:33

182022000204060810

Cloud cover93% avg

100

Moonrise23:42

MoonsetPast dawn

Peak alt65° @ 09:00

Lunar day23.6

Sun

Waning Crescent · 25% illuminated

1 out of 100

60° 30° 0°

▲Moonrise 01:05

☀ Sunset 19:49

☀ Sunrise 06:35

182022000204060810

Cloud cover94% avg

100

Moonrise01:05

MoonsetPast dawn

Peak alt62° @ 10:00

Lunar day24.6

Mon

Waning Crescent · 16% illuminated

34 out of 100

60° 30° 0°

▲Moonrise 02:35

▼Moonset 18:31

☀ Sunset 19:47

☀ Sunrise 06:36

182022000204060810

Cloud cover62% avg

100

Moonrise02:35

Moonset18:31

Peak alt56° @ 10:00

Lunar day25.6

Tue

Waning Crescent · 9% illuminated

84 out of 100

60° 30° 0°

▲Moonrise 04:06

▼Moonset 18:52

☀ Sunset 19:44

☀ Sunrise 06:38

182022000204060810

Cloud cover17% avg

Moonrise04:06

Moonset18:52

Peak alt47° @ 10:00

Lunar day26.6

Wed

Waning Crescent · 4% illuminated

0 out of 100

60° 30° 0°

▲Moonrise 05:32

▼Moonset 19:08

☀ Sunset 19:42

☀ Sunrise 06:40

182022000204060810

Cloud cover100% avg

100

Moonrise05:32

Moonset19:08

Peak alt36° @ 10:00

Lunar day27.6

Thu

New Moon · 1% illuminated

1 out of 100

60° 30° 0°

▲Moonrise 06:56

▼Moonset 19:21

☀ Sunset 19:40

☀ Sunrise 06:41

182022000204060810

Cloud cover99% avg

100

Moonrise06:56

Moonset19:21

Peak alt25° @ 10:00

Lunar day28.6

Fri

New Moon · 0% illuminated

0 out of 100

60° 30° 0°

▼Moonset 19:33

☀ Sunset 19:37

☀ Sunrise 05:37

182022000204060810

Cloud cover45% avg

MoonriseAlready up

Moonset19:33

Peak alt14° @ 10:00

Lunar day0.1

Swipe / scroll, or tap a day above

Aurora Kp · 3-Day Forecast

NOAA SWPC · 3-hourly

Higher Kp = stronger geomagnetic activity = better aurora chances. For UK observers, Kp 4+ means aurora is possible from N. Scotland; Kp 5+ brings it across the whole UK.

Today

Sat 5 Sep

Quiet

Peak Kp 2.7 at 03:00 UTC

No aurora expected — geomagnetic field calm.

9630

2.7 · 03:00

0003060912151821

Tomorrow

Sun 6 Sep

Quiet

Peak Kp 1.7 at 00:00 UTC

No aurora expected — geomagnetic field calm.

9630

1.7 · 00:00

0003060912151821

Mon 7

Mon 7 Sep

Unsettled

Peak Kp 3.7 at 12:00 UTC

Slightly unsettled — minor activity, no aurora expected.

9630

3.7 · 12:00

0003060912151821

Aurora Forecast Map

Global — OVATION Model

UK Focus

Your Night Sky

Meteor Showers

Coming up this year

Orionids Oct 21

Oct 2 – Nov 7

Fast, with persistent trains.

Leonids Nov 17

Nov 6 – Nov 30

Occasional storms. Fast, bright.

Geminids Dec 14

Dec 4 – Dec 20

Best of the year. Bright, multi-coloured.

Earlier this year

Quadrantids Jan 4

Jan 1 – Jan 6

Strong, short-lived peak. Bright fireballs.

Lyrids Apr 22

Apr 16 – Apr 25

Sparse, sometimes glowing trails.

Eta Aquariids May 6

Apr 19 – May 28

Best before dawn. Fast meteors.

Delta Aquariids Jul 30

Jul 12 – Aug 23

Steady rates, faint. Best late night.

Perseids Aug 12

Jul 17 – Aug 24

Bright, reliable. Best summer shower.

Light Pollution Map

Understanding the stargazing score

The stargazing score combines cloud cover and moon illumination to estimate how good conditions are for observing the night sky. Cloud cover is the dominant factor — even the darkest location is useless under heavy cloud.

The Bortle scale measures light pollution from 1 (pristine dark sky) to 9 (inner-city sky). In the UK, the best accessible sites reach Bortle 2 to 3, found in areas like Northumberland International Dark Sky Park, parts of the Lake District, Snowdonia, the Brecon Beacons, and the Scottish Highlands. At Bortle 3, the Milky Way is clearly visible and dozens of deep-sky objects are observable with binoculars.

Moon phase matters: A new moon (0% illumination) provides the darkest sky. A full moon floods the sky with light, washing out everything except planets and the brightest stars. The best stargazing combines a new or thin crescent moon with clear skies.

Practical tips: Give your eyes 20 to 30 minutes to dark-adapt after arriving at your spot. Avoid looking at phone screens (use a red-light torch instead). The hours after midnight are often best, as the atmosphere settles and any remaining cloud may clear.

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This uses Environment Agency rainfall data from the real-time data API (Beta). Rainfall data from the Scottish Environment Protection Agency (SEPA), licensed under the Open Government Licence v3.0. Natural Resources Wales data is licensed under the Open Government Licence v3.0. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.

Planning aid, not a safety service. Check official warnings before you go. Safety information

Weather data by Open-Meteo.com (UK Met Office Seamless) · Map data © OpenStreetMap contributors · Data sources & licences