Active location

Cadair Idris, Gwynedd

52.70°N, 3.91°W · ~820m · 07:46 – 18:13

Updated 21:23

Temp

3°C

↑ 0.5 / 1hr

Wind

6.0

↓ 0.7 / 1hr

Condition

Clear

Score

7.3

Good


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

Sun 18 Oct			Mon 19 Oct																								Tue 20 Oct																								Wed 21 Oct																								Thu 22 Oct																								Fri 23 Oct																								Sat 24 Oct																								Sun 25 Oct
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

-	-	-	-	-	-	-	-	0.3	0.2	-	0.1	0.1	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.1	0.1	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1.7	1.7	1.7	1.6	1.6	1.6	0.2	0.2	0.2	-	-	-	-	-	-	0.3	0.3	0.3	0.2	0.2	0.2	0.1	0.1	0.1	-	-	-	-	-	-	-	-	-	-	-	-	1.2	1.2	1.2	3.6	3.6	3.6	1.2	1.2	1.2	0.1	0.1	0.1	0.4	0.4	0.4	1.1	1.1	1.1	2.3	2.3	2.3	1	1	1	-	-	-	0.3	0.3	0.3	-	-	-	-	-	-	-	-	-	-	-	-	0.6	0.6	0.6	0.6	0.6	0.6	2	2	2	2	2
5%	20%	20%	20%	25%	25%	5%	40%	90%	100%	55%	100%	100%	40%	35%	20%	15%	15%	20%	10%	10%	0%	0%	0%	0%	5%	5%	10%	10%	10%	10%	10%	10%	10%	10%	10%	65%	70%	0%	0%	0%	10%	5%	0%	10%	10%	10%	10%	0%	5%	10%	10%	10%	10%	15%	15%	25%	25%	75%	100%	100%	100%	100%	100%	100%	75%	65%	65%	15%	0%	0%	10%	10%	30%	85%	90%	90%	85%	80%	75%	75%	75%	60%	5%	0%	0%	5%	10%	15%	15%	10%	10%	15%	20%	45%	95%	100%	100%	100%	100%	100%	95%	95%	90%	70%	70%	70%	80%	85%	90%	100%	100%	95%	95%	95%	95%	95%	95%	95%	40%	15%	20%	65%	70%	70%	25%	15%	15%	15%	15%	15%	15%	15%	15%	20%	20%	40%	70%	75%	80%	85%	85%	90%	100%	100%	100%	100%	100%

3°	4°	3°	3°	3°	3°	3°	4°	3°	3°	3°	4°	5°	5°	5°	6°	7°	7°	7°	7°	6°	5°	5°	5°	4°	4°	4°	4°	4°	4°	4°	4°	4°	5°	5°	4°	5°	6°	6°	6°	7°	7°	7°	7°	7°	6°	6°	5°	3°	2°	0°	0°	0°	0°	1°	1°	1°	2°	2°	3°	3°	3°	3°	2°	2°	3°	4°	4°	4°	3°	3°	2°	2°	1°	1°	1°	1°	2°	3°	3°	3°	3°	2°	3°	4°	4°	5°	6°	6°	7°	7°	7°	6°	6°	5°	4°	4°	4°	5°	6°	7°	8°	8°	8°	7°	6°	5°	5°	5°	5°	5°	4°	3°	3°	3°	3°	3°	3°	3°	3°	3°	3°	3°	3°	2°	3°	3°	3°	3°	3°	2°	3°	3°	4°	4°	5°	5°	6°	6°	7°	7°	7°	8°	8°	9°	9°	9°	10°
-0°	0°	-1°	-1°	-1°	-1°	-1°	-1°	-0°	-1°	-0°	1°	1°	2°	2°	2°	3°	3°	3°	3°	3°	2°	1°	1°	1°	1°	0°	-0°	-0°	-0°	0°	0°	1°	1°	1°	1°	2°	3°	3°	3°	4°	5°	4°	4°	4°	3°	3°	2°	0°	-2°	-3°	-3°	-3°	-3°	-3°	-2°	-2°	-1°	-1°	-1°	-2°	-3°	-3°	-3°	-3°	-3°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-2°	-1°	-2°	-2°	-2°	-2°	-1°	1°	1°	2°	2°	3°	4°	4°	3°	3°	2°	0°	-1°	-2°	-1°	1°	2°	3°	4°	4°	3°	2°	2°	2°	3°	3°	0°	-3°	-5°	-6°	-6°	-6°	-6°	-6°	-6°	-6°	-6°	-6°	-6°	-6°	-5°	-5°	-5°	-5°	-4°	-4°	-4°	-3°	-2°	-1°	-1°	-0°	1°	1°	2°	3°	4°	5°	6°	6°	6°	6°	6°	6°

NE	NE	NE	NE	NE	NE	ENE	NE	NE	NE	NE	ENE	E	E	ESE	ESE	SE	SE	SE	ESE	SE	ESE	ESE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SSE	E	SSE	SSE	S	SW	SSW	SSW	S	S	SSE	SE	ESE	E	E	E	ENE	ENE	ENE	NE	NE	NNE	N	NNW	NW	NW	NW	WNW	WNW	WNW	WNW	WNW	W	W	WSW	SW	SW	S	SE	E	SSE	SSW	W	W	W	W	W	W	W	W	WSW	WSW	SW	SSW	S	SSE	SE	SE	ESE	ESE	ESE	ESE	SE	SE	SE	SSE	S	SSE	SE	ESE	SSE	SW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	W	W	W	WSW	WSW	SW	SW	SW	SW	SSW	SSW	SSW	SSW	SSW	SW	SW	SW
6	5	8	6	7	7	10	9	7	8	8	5	9	9	10	11	10	10	9	9	7	7	8	9	9	9	10	11	11	10	7	9	6	8	8	7	5	2	3	4	2	2	5	3	3	4	5	6	4	6	5	5	5	5	5	5	4	3	3	7	12	15	16	15	14	15	15	15	14	11	9	6	4	3	2	2	4	6	9	12	13	13	12	11	9	7	8	8	9	7	5	4	4	4	6	10	16	20	20	18	16	14	12	10	9	9	9	6	4	5	11	21	28	30	28	27	27	28	28	28	27	27	26	25	24	24	23	22	20	18	15	14	13	13	14	13	13	11	10	8	6	5	5	6	8	10	12	15
17	15	21	18	20	19	26	25	20	21	20	16	24	22	25	27	24	24	23	21	19	19	21	24	24	23	23	25	25	23	17	19	15	17	18	15	11	5	7	9	6	5	10	7	6	9	12	12	8	10	7	7	7	7	7	7	5	3	4	12	23	30	31	29	27	27	28	27	24	19	14	11	7	5	3	3	5	9	15	19	21	21	20	18	15	13	14	16	17	15	11	9	9	10	13	21	32	39	39	36	32	28	23	19	18	17	16	12	7	8	21	39	53	55	51	49	49	49	49	49	49	48	46	44	43	42	41	39	36	31	27	25	23	22	25	24	23	21	18	15	13	11	10	12	15	18	22	26

89	87	90	92	93	93	88	85	91	98	99	100	99	98	95	87	84	79	78	76	77	82	84	84	86	88	87	86	86	86	87	85	81	76	76	79	74	70	74	77	73	71	71	68	71	74	75	83	87	88	91	91	92	92	93	93	93	94	94	94	94	93	92	91	88	83	77	73	72	73	75	79	84	89	92	95	96	95	93	91	90	90	89	86	82	78	74	69	66	66	67	69	72	75	79	83	87	90	91	92	92	92	91	91	91	92	93	94	95	95	93	91	89	89	89	89	87	83	80	77	75	74	77	82	84	81	76	73	73	74	75	74	72	71	75	76	77	79	83	87	90	94	96	97	97	97	97	96
935	935	934	933	932	931	930	930	929	928	928	928	929	929	928	928	928	927	927	927	926	925	925	925	924	924	923	923	922	921	920	920	919	918	918	917	916	916	915	915	914	913	913	912	911	910	910	909	908	907	906	906	905	905	904	904	904	904	904	904	905	906	907	908	909	910	910	911	911	911	911	911	910	910	910	909	909	910	910	910	911	911	912	912	913	914	914	915	915	914	914	913	912	911	909	907	905	902	900	898	896	895	894	893	892	891	891	891	892	892	893	895	896	898	900	902	904	905	906	907	908	909	910	910	911	911	912	912	913	913	913	913	913	913	913	912	912	911	910	909	908	907	907	907	907	907	907	907
32.9	29.9	26.9	23.7	24.7	26.9	33.3	32	11.5	15	8.4	2.1	11	9.2	19.5	33.7	33.6	35.8	34.7	33.9	32.2	30	28.5	27	25.1	23.1	23	21.9	21.6	23.1	23.1	24.8	28	30.9	30.7	29.8	29.8	38.8	37.1	31.8	35.1	37.3	37.3	44.3	44	39.2	36.1	30	28.2	24.7	19.7	19.4	19.1	18.9	18.7	18.5	14	9.6	5.1	4.5	3.9	3.3	3.7	4.1	4.4	11.1	17.7	24.4	23.7	23.1	22.4	21.6	20.9	20.1	18.6	17.1	15.6	14.2	12.8	11.4	14.6	17.8	21	22.3	23.6	24.8	25.5	26.1	26.7	26.6	26.5	26.4	25.8	25.2	24.6	19.2	13.8	8.5	6.6	4.6	2.7	8.5	14.3	20.1	15.7	11.2	6.8	5.6	4.3	3.1	3.5	3.9	4.3	3.8	3.4	3	8.6	14.2	19.8	17.7	15.6	13.6	12.8	12	11.2	15.2	19.1	23.1	23.4	23.7	24.1	24.5	24.9	25.2	18.7	12.2	5.7	5.4	5.1	4.8	4.5	4.2	3.8	3.6	3.4	3.2	3	2.7
-	-	-	-	-	-	-	-	-	-	-	-	-	0.2	0.5	1.1	1	0.9	0.4	0.3	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.2	0.4	0.8	1.3	1.4	1.1	0.8	0.3	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.3	0.6	0.8	1	1.1	1.3	1.1	0.8	0.5	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.7	1.4	1.7	1.7	1.5	1.4	1.1	0.8	0.4	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.4	0.7	0.8	1	1	1	0.8	0.6	0.3	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.4	0.8	1	1.2	1.2	1.1	0.9	0.6	0.3	-	-	-	-	-	-	-
0	0	0	0	0	0	0	0	0	0	0	0	0	10	20	20	20	20	20	20	10	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	10	10	10	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	10	10	10	10	10	10	20	20	10	10	0	0	0	0	0	0	0	10	20	20	20	10	0	0	0	10	20	30	40	40	40	30	20	10	0	0	0	0	0	0	0	20	50	60	50	20	0	10	30	40	40	30	20	20	30	30	30	20	20	10	0	0	0	10	20	20	20	20	10	10	0	0	10	10	10	20	20	20	20	10	10	0	0	0	0	0	0	0
7.3	7.6	6.5	7.1	6.8	6.9	5.6	5.7	5.3	5.1	5.5	6.3	4.8	5.1	4.4	5.3	5.7	4.5	4.9	6.3	6.8	6.8	6.5	5.9	6.0	6.0	5.9	4.3	4.2	4.8	6.0	5.3	6.2	5.7	5.6	6.2	6.8	8.7	10.0	8.6	10.0	10.0	8.3	10.0	10.0	7.3	6.7	7.9	8.6	8.1	8.5	8.5	8.5	8.5	8.6	8.6	10.0	10.0	8.8	5.3	3.2	1.6	1.5	2.0	2.3	3.2	3.0	3.1	5.1	6.2	7.1	7.9	8.7	8.8	8.6	8.6	8.6	6.8	6.8	5.8	5.6	5.6	5.8	6.4	7.1	7.5	7.4	7.0	5.7	6.2	6.8	7.3	7.4	7.2	6.5	4.0	1.6	0.1	0.0	0.0	0.0	2.5	3.5	4.3	5.3	5.4	5.6	6.3	7.3	7.0	3.9	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.2	0.6	1.0	1.2	1.6	1.2	2.3	3.2	3.7	4.1	4.3	3.8	3.9	4.2	4.2	4.9	5.5	6.1	6.5	6.6	5.3	4.7	3.9	2.9	2.1

Day average: 7.3/10

Best window: 21:00-22:00 · Avg 7.3

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

Mostly dry, bright and usable

6° / 0° · Today · Sun 18

Dry through the day with little or no measurable rain. Northeasterly winds averaging around 6 mph with peaks near 9 mph, gusting to 21 mph. Temperatures range from 0C to 6C with a mix of sun and cloud. Watch for a frost risk in colder spots.

0.0 mm

Rain total

9 mph NE

Wind max

gusts 21 mph

1.2

UV max

peak 12:00

Off-season

Pollen

Air quality

Fair

Very low

Thunder

CAPE 20

Atmosphere

Cloud avg 32%

Freezing level 1,270 mup to 2,230 m

Fog risk Low

Sun & Moon

07:46 / 18:13

Sun ↑↓

10 h 27 m

Daylight

15:33 / 23:19

Moon ↑↓

First Quarter

Moon phase

51% lit

Live rain radar

LIVE

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Light Moderate Heavy

Radar data by RainViewer

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Ground conditions

Is it muddy out there?

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0 mm

Last 24 h

32.2 mm

Last 7 days

Measured at Corris - Aberllefenni raingauge rain gauge, 6.9 km away

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Rain gauges and totals stay free for everyone

Layer	Item	Material	Why
Base	Thermal base layer	Heavyweight merino or synthetic thermal; avoid cotton	-3°C feels temp
Mid	Down or heavy fleece	Down OK today (dry forecast), or heavy fleece. Consider 2 mid layers	Wind chill feels like -3°C
Outer	Waterproof (in pack)	Lightweight packable shell because UK weather changes fast	Always carry because conditions shift quickly
Lower	Insulated trousers	Softshell or fleece-lined walking trousers	Sub-zero wind chill on exposed legs
Feet	Insulated waterproof boots	Stiff sole for frozen ground, thick socks (wool blend)	Frozen ground, ice risk
Extras	Warm hat, thick gloves, balaclava	Windproof gloves, spare pair. Consider microspikes for ice	Feels like -3°C with a risk to exposed skin

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 Eryri / Snowdonia & North Wales region

Unlikely

Sunday afternoon BEST

No clear window yet.

Confidence: N/A

SUN AFTERNOON

No clear window

Unlikely

Confidence: N/A

MON MORNING

No clear window

Unlikely

Confidence: N/A

MON AFTERNOON

No clear window

Unlikely

Confidence: N/A

Tap a period for detail

Key Factors

Temperature lid

Poor

Valley moisture

Poor

Layer contrast

Poor

Summit clarity

Poor

Wind speed

Poor

Duration

No temperature inversion detected

Marginal moisture below

No moisture contrast, diffuse profile

Saturated above, no clear cap

Too windy, mixing likely

No sustained favourable window

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Example email alert

Dolgellau Very likely

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

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Email alerts sent up to 24h ahead.

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Cloud Inversion Heatmap

Atmospheric Profile · Dolgellau · 11 m

Region Anchor

Loading… Timeline

Surface Pressure

Humidity at Pressure Levels

Higher humidity means the air is closer to saturation.

Temperature at Pressure Levels

Warmer air above cooler air can indicate an inversion.

All heights shown equally.

Golden Hour

Today

DARKNESS

DAYLIGHT

07:01

07:26

07:46 Sunrise

08:06

08:31

Golden Hour · 40 min

Be at your summit by 07:26

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.

Cloud inversions explained

What is a cloud inversion near Cadair Idris, Gwynedd?

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 Cadair Idris, Gwynedd 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 Cadair Idris cloud inversion page Read the full UK cloud inversion guide See how WeatherDuck forecasts inversions

Common questions

When are cloud inversions most likely near Cadair Idris?

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

Poor conditions Cloudy outlook — limited stargazing tonight.

Moon First Quarter 52%

Cloud Cover Partly cloudy 61%

Moon Times Rise 15:33 · Set 23:19

Sky Clarity 25 km Clear

Lunar Day Day 7.6

Light Pollution View map ↓

Tonight's Aurora

Aurora & Solar Wind NOAA

3.7 Planetary Kp Very Low

Wind Speed 415 km/s

Bz 3.7 nT

Density 2.0 p/cm³

Bt 5.1 nT

No significant aurora activity expected tonight.

Nightly Outlook

Tonight · 18 Oct

First Quarter · 52% illuminated

31/100

Best window 21:43–03:43 Lower cloud and a low or hidden moon.

Moon height above horizon DaylightGreen = best stargazing hours

18:00–10:00 next morning

Moonset 23:19 Sunset 18:13Sunrise 07:48

Every hour in detail

Hours after midnight are the following morning.
Hour	Cloud cover	Moon
18:00	94%	Above horizon
19:00	76%	Above horizon
20:00	22%	Above horizon
21:00	21%	Above horizon
22:00	51%	Above horizon
23:00	52%	Above horizon
00:00	55%	Below horizon
01:00	52%	Below horizon
02:00	53%	Below horizon
03:00	44%	Below horizon
04:00	84%	Below horizon
05:00	100%	Below horizon
06:00	100%	Below horizon
07:00	100%	Below horizon
08:00	100%	Below horizon
09:00	100%	Below horizon

Highest moon 14° at 19:20 Lunar day 7.6

Mon · 19 Oct

Waxing Gibbous · 63% illuminated

27/100

No good window tonight conditions don't line up tonight

Moon height above horizon Daylight

18:00–10:00 next morning

Moonset 00:34 Sunset 18:11Sunrise 07:50

Every hour in detail

Hours after midnight are the following morning.
Hour	Cloud cover	Moon
18:00	3%	Above horizon
19:00	7%	Above horizon
20:00	12%	Above horizon
21:00	11%	Above horizon
22:00	15%	Above horizon
23:00	28%	Above horizon
00:00	81%	Above horizon
01:00	99%	Below horizon
02:00	95%	Below horizon
03:00	89%	Below horizon
04:00	96%	Below horizon
05:00	100%	Below horizon
06:00	100%	Below horizon
07:00	100%	Below horizon
08:00	100%	Below horizon
09:00	100%	Below horizon

Highest moon 18° at 20:20 Lunar day 8.6

Tue · 20 Oct

Waxing Gibbous · 72% illuminated

48/100

Best window 00:39–05:39 Lower cloud and a low or hidden moon.

Moon height above horizon DaylightGreen = best stargazing hours

18:00–10:00 next morning

Moonset 01:51 Sunset 18:09Sunrise 07:52

Every hour in detail

Hours after midnight are the following morning.
Hour	Cloud cover	Moon
18:00	100%	Above horizon
19:00	94%	Above horizon
20:00	66%	Above horizon
21:00	25%	Above horizon
22:00	4%	Above horizon
23:00	2%	Above horizon
00:00	6%	Above horizon
01:00	8%	Above horizon
02:00	7%	Below horizon
03:00	6%	Below horizon
04:00	15%	Below horizon
05:00	40%	Below horizon
06:00	72%	Below horizon
07:00	95%	Below horizon
08:00	100%	Below horizon
09:00	100%	Below horizon

Highest moon 22° at 21:00 Lunar day 9.6

Wed · 21 Oct

Waxing Gibbous · 81% illuminated

24/100

Best window 04:37–06:37 Lower cloud and a low or hidden moon.

Moon height above horizon DaylightGreen = best stargazing hours

18:00–10:00 next morning

Moonset 03:08 Sunset 18:07Sunrise 07:53

Every hour in detail

Hours after midnight are the following morning.
Hour	Cloud cover	Moon
18:00	30%	Above horizon
19:00	26%	Above horizon
20:00	37%	Above horizon
21:00	65%	Above horizon
22:00	88%	Above horizon
23:00	98%	Above horizon
00:00	99%	Above horizon
01:00	96%	Above horizon
02:00	88%	Above horizon
03:00	76%	Above horizon
04:00	63%	Below horizon
05:00	48%	Below horizon
06:00	34%	Below horizon
07:00	23%	Below horizon
08:00	18%	Below horizon
09:00	16%	Below horizon

Highest moon 28° at 21:40 Lunar day 10.6

Thu · 22 Oct

Waxing Gibbous · 89% illuminated

2/100

No good window tonight 97% cloud cover all night

Moon height above horizon Daylight

18:00–10:00 next morning

Moonset 04:26 Sunset 18:05Sunrise 07:55

Every hour in detail

Hours after midnight are the following morning.
Hour	Cloud cover	Moon
18:00	100%	Above horizon
19:00	100%	Above horizon
20:00	100%	Above horizon
21:00	100%	Above horizon
22:00	100%	Above horizon
23:00	100%	Above horizon
00:00	100%	Above horizon
01:00	100%	Above horizon
02:00	98%	Above horizon
03:00	94%	Above horizon
04:00	92%	Above horizon
05:00	92%	Below horizon
06:00	93%	Below horizon
07:00	95%	Below horizon
08:00	97%	Below horizon
09:00	98%	Below horizon

Highest moon 34° at 22:20 Lunar day 11.6

Fri · 23 Oct

Waxing Gibbous · 95% illuminated

11/100

No good window tonight 81% cloud cover all night

Moon height above horizon Daylight

18:00–10:00 next morning

Moonset 05:47 Sunset 18:03Sunrise 07:57

Every hour in detail

Hours after midnight are the following morning.
Hour	Cloud cover	Moon
18:00	100%	Above horizon
19:00	99%	Above horizon
20:00	94%	Above horizon
21:00	87%	Above horizon
22:00	80%	Above horizon
23:00	75%	Above horizon
00:00	72%	Above horizon
01:00	70%	Above horizon
02:00	72%	Above horizon
03:00	75%	Above horizon
04:00	80%	Above horizon
05:00	87%	Above horizon
06:00	94%	Below horizon
07:00	99%	Below horizon
08:00	100%	Below horizon
09:00	100%	Below horizon

Highest moon 40° at 23:20 Lunar day 12.6

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

Sun 18 Oct

Quiet

Peak Kp 2.3 at 03:00 UTC

No aurora expected — geomagnetic field calm.

9630

2.3 · 03:00

0003060912151821

Tomorrow

Mon 19 Oct

Unsettled

Peak Kp 4.7 at 18:00 UTC

Faint aurora possible from N. Scotland.

9630

4.7 · 18:00

0003060912151821

Tue 20

Tue 20 Oct

Unsettled

Peak Kp 4.7 at 03:00 UTC

Faint aurora possible from N. Scotland.

9630

4.7 · 03:00

0003060912151821

Aurora Forecast Map

Global — OVATION Model

UK Focus

Your Night Sky

Meteor Showers

Orionids Active Now

Oct 2 – Nov 7 · Peak Oct 21

Fast, with persistent trains.

days to peak

Coming up this year

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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Cadair Idris, Gwynedd

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Nightly Outlook

Tonight · 18 Oct

Mon · 19 Oct

Tue · 20 Oct

Wed · 21 Oct

Thu · 22 Oct

Fri · 23 Oct

Aurora Kp · 3-Day Forecast

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