Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence throughout, though some uncertainty with extent of any fog patches early Sunday morning and the development of any light showers late morning.
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
A fine and dry day, with plenty of sunny spells.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
<05% | 20% | 20% | 10% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
NE
9
|
N
7
|
N
8
|
N
8
|
N
12
|
E
9
|
| 600m |
E
6
|
N
7
|
N
7
|
N
8
|
N
8
|
E
7
|
| 300m |
SE
3
|
N
5
|
N
6
|
N
7
|
N
7
|
SE
3
|
| Valley |
S
3
|
N
5
|
N
7
|
N
7
|
N
7
|
N
3
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 10 | 10 | 11 | 11 | 16 | 12 |
| 600m | 7 | 9 | 10 | 11 | 13 | 10 |
| 300m | 4 | 7 | 9 | 11 | 13 | 6 |
| Valley | 4 | 8 | 10 | 11 | 12 | 5 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
1°
|
2°
|
2°
|
3°
|
2°
|
2°
|
| 600m |
4°
|
4°
|
5°
|
6°
|
5°
|
4°
|
| 300m |
5°
|
7°
|
8°
|
9°
|
7°
|
5°
|
| Valley |
6°
|
8°
|
9°
|
10°
|
8°
|
6°
|
| Freezing Level |
900m
|
1,000m
|
1,000m
|
1,000m
|
800m
|
800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-2°
|
-2°
|
-1°
|
0°
|
-2°
|
-2°
|
| 600m |
1°
|
2°
|
3°
|
3°
|
2°
|
1°
|
| 300m |
4°
|
6°
|
6°
|
7°
|
5°
|
4°
|
| Valley |
6°
|
7°
|
8°
|
8°
|
7°
|
5°
|
Additional weather information
Meteorologist's view
Despite the sunshine and moderate UV levels, the feels like temperature is expected to remain below freezing throughout the day on the summit of Yr Wydfa, so extra layers will be needed.
Weather
Chilly to start, with a patchy frost and some mist or fog. This quickly clearing to leave a fine day, with sunny intervals and patchy cloud. Perhaps an isolated late morning or early afternoon shower, mainly in the east.
Chance of cloud-free hill tops
100% throughout.
Low cloud and visibility
Mist and fog patches may lift briefly to low cloud around 400-600m before clearing. Otherwise excellent visibility is expected throughout. Locally very poor first thing in any fog patches and moderate on any isolated light showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Early morning mist and fog patches clearing to a largely fine day, with sunny spells. A very low chance of the odd light shower developing my mid-afternoon once again.
Chance of cloud-free hill tops
100% throughout.
Maximum wind speed expected
Northeasterly 10-15 mph gusting 15-20 mph.
Temperature
- At 800m Minus 1 Celsius, rising to plus 4 Celsius.
- Valley Plus 1 Celsius, rising to plus 12 Celsius.
- Freezing level 800m, soon lifting above the summits.
Low cloud and visibility
Mist and fog patches may lift briefly to low cloud around 300-600m before clearing. Otherwise excellent visibility is expected throughout. Locally very poor first thing in any fog patches. Locally moderate visibility in any passing light showers.
Mountain weather information
Tue 21 Apr
Sunrise:
Sunset:
A cloudy morning, with some hill fog. Clouds lifting and breaking by the afternoon, with some sunshine possible, but the risk of a few passing showers. A brisk easterly wind developing, making it feel rather cold on the summits.
Wed 22 Apr
Sunrise:
Sunset:
Early mist and frost clearing to leave a sunny day, with a strong and gusty easterly wind.
Thu 23 Apr
Sunrise:
Sunset:
Staying sunny, with a gusty easterly wind making it feel colder than the temperature suggests.
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.