Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for Wednesday. Lower for the timing of rain later Thursday.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
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
Largely dry and fine with plenty of sunshine into the day. Fresh summit winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | <05% | 00% | 00% | 00% | 00% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
SE
22
|
SE
29
|
S
19
|
S
20
|
SE
25
|
SE
33
|
| 600m |
SE
15
|
S
19
|
S
15
|
S
17
|
S
17
|
S
21
|
| 300m |
SE
8
|
SE
11
|
S
11
|
S
12
|
S
9
|
SE
15
|
| Valley |
SE
9
|
SE
12
|
S
11
|
S
12
|
S
9
|
S
15
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 26 | 33 | 24 | 25 | 31 | 39 |
| 600m | 21 | 26 | 20 | 23 | 24 | 29 |
| 300m | 18 | 23 | 17 | 19 | 21 | 28 |
| Valley | 18 | 23 | 17 | 19 | 21 | 29 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
6°
|
5°
|
7°
|
8°
|
6°
|
5°
|
| 600m |
8°
|
8°
|
9°
|
10°
|
9°
|
8°
|
| 300m |
10°
|
10°
|
12°
|
13°
|
11°
|
10°
|
| Valley |
10°
|
11°
|
14°
|
15°
|
12°
|
11°
|
| Freezing Level |
1,800m
|
1,600m
|
1,700m
|
1,700m
|
1,500m
|
1,500m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
1°
|
0°
|
2°
|
3°
|
1°
|
-1°
|
| 600m |
5°
|
4°
|
6°
|
7°
|
6°
|
4°
|
| 300m |
8°
|
8°
|
10°
|
11°
|
9°
|
7°
|
| Valley |
9°
|
9°
|
12°
|
12°
|
10°
|
8°
|
Additional weather information
Meteorologist's view
A generally fine day expected. Note some mild afternoon temperatures at valley level in the sunshine, contrasting with a significantly cool feel at height given the fresh breeze.
Weather
Largely cloudy at first with some patchy light rain possible towards dawn. A dry day then following with cloud clearing to give clear skies and generally mild temperatures.
Chance of cloud-free hill tops
90%.
Low cloud and visibility
Some very patchy low cloud possible initially on lower slopes, most likely in the east of the range, but cloud bases generally well above summits. Visibility generally good, although perhaps slightly hazy.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry and bright start to the day. Cloud feeding from the west from mid-afternoon, with an area of occasionally heavy rain gradually crossing the area for the late afternoon and evening, which turns wintry across the highest peaks during the evening. Fresh to strong summit winds.
Chance of cloud-free hill tops
70% becoming 10% for the late afternoon
Maximum wind speed expected
South or southeast 20-30mph with gusts reaching 45mph across most exposed ridges and summits.
Temperature
- At 800m Plus 5-7 Celsius
- Valley Plus 4 Celsius increasing 16 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor within cloud, this becoming extensive above around 500-800m into the evening.
Mountain weather information
Fri 6 Mar
Sunrise:
Sunset:
Patchy rain and summit snow at first but becoming drier into the day with bright spells. Fresh to strong winds. Freezing level 900m lifting above summits by late morning.
Sat 7 Mar
Sunrise:
Sunset:
Increasingly cloudy with occasional rain likely. Fresh winds. Freezing level above summits.
Sun 8 Mar
Sunrise:
Sunset:
Cloudy with further risk of rain, though most of this should be light and perhaps turning brighter into the day. Fresh 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.