Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for relatively settled, save for a weakening front crossing the area late Sunday, but lowering for the cloud detail.
This evening forecast
Dry with clear spells. Fresh summit winds developing. Freezing level above the summits.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
Dry with prolonged periods of sunny. Light winds.
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
00% | 00% | 00% | 00% | 00% | 00% | 00% | 00% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
SE
7
|
SE
5
|
N
5
|
NE
7
|
E
5
|
SW
4
|
SE
4
|
SE
6
|
| 600m |
SE
6
|
SE
3
|
E
4
|
NE
4
|
NE
6
|
NE
6
|
E
3
|
SE
6
|
| 300m |
SE
5
|
SE
3
|
SE
3
|
NE
2
|
NE
4
|
NW
5
|
SW
2
|
SE
4
|
| Valley |
SE
5
|
S
3
|
SE
2
|
NE
2
|
N
5
|
N
6
|
SW
3
|
SE
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m | 10 | 6 | 7 | 9 | 8 | 8 | 6 | 8 |
| 600m | 8 | 5 | 6 | 6 | 9 | 10 | 4 | 8 |
| 300m | 7 | 5 | 4 | 5 | 8 | 9 | 3 | 7 |
| Valley | 8 | 5 | 3 | 4 | 8 | 10 | 5 | 9 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
9°
|
8°
|
7°
|
8°
|
10°
|
10°
|
8°
|
6°
|
| 600m |
10°
|
9°
|
8°
|
10°
|
12°
|
12°
|
10°
|
8°
|
| 300m |
11°
|
10°
|
9°
|
12°
|
14°
|
15°
|
11°
|
9°
|
| Valley |
12°
|
11°
|
10°
|
12°
|
15°
|
15°
|
12°
|
10°
|
| Freezing Level |
2,100m
|
2,000m
|
2,000m
|
1,900m
|
1,600m
|
1,500m
|
1,600m
|
1,500m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
7°
|
6°
|
6°
|
7°
|
9°
|
9°
|
7°
|
4°
|
| 600m |
9°
|
8°
|
7°
|
9°
|
10°
|
11°
|
9°
|
6°
|
| 300m |
10°
|
10°
|
9°
|
12°
|
13°
|
14°
|
11°
|
8°
|
| Valley |
11°
|
10°
|
9°
|
12°
|
14°
|
14°
|
12°
|
9°
|
Additional weather information
Meteorologist's view
Good conditions, but risk sunburn in afternoon sunshine.
Weather
Dry with good clear then sunny spells developing.
Chance of cloud-free hill tops
90% plus
Low cloud and visibility
Good or very good
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry with prolonged clear then sunny periods. Light winds.
Chance of cloud-free hill tops
90% plus
Maximum wind speed expected
Variable 15mph or less
Temperature
- At 800m Plus 4 Celsius at dawn increasing 10 Celsius for the afternoon
- Valley Plus 1 Celsius increasing 17 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good
Mountain weather information
Sat 21 Mar
Sunrise:
Sunset:
Dry with plentiful bright and sunny spells. Light winds. Freezing level above summits.
Sun 22 Mar
Sunrise:
Sunset:
Dry and occasionally bright start. Some patchy rain from late afternoon. Freshening summit winds. Freezing level above summits.
Mon 23 Mar
Sunrise:
Sunset:
Bright spells and scattered showers. Strong to gale summit winds. Freezing level above summits.
Updated at:
Summit specific forecast
Mountain summit forecast map
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Key
Mountain summits
Other points of interest
Cluster of multiple stations
The Eryri (Snowdonia) mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Yr Wyddfa (Snowdon), standing at 1,085 metres.