Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for the mobile nature of the westerly weather patterns, but lowering for the transitional timing detail.
This evening forecast
Occasional showers of snow and rain mixed with clear spells. Strong summit winds. Freezing level 600m.
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.
Poor Visibility
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.
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
Fair start. Patchy snow and rain later. Fresh to strong 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) |
40% | 30% | 20% | 10% | 10% | 10% | 20% | 70% |
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 |
NW
24
|
NW
23
|
NW
20
|
NW
13
|
W
13
|
W
16
|
SW
19
|
SW
24
|
| 600m |
NW
16
|
NW
12
|
NW
9
|
NW
10
|
W
11
|
W
13
|
SW
14
|
SW
16
|
| 300m |
NW
10
|
NW
7
|
W
5
|
NW
7
|
W
9
|
W
10
|
SW
9
|
S
11
|
| Valley |
NW
10
|
NW
7
|
W
5
|
NW
7
|
W
9
|
W
10
|
SW
9
|
S
11
|
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 | 30 | 29 | 25 | 17 | 18 | 21 | 24 | 30 |
| 600m | 21 | 17 | 12 | 14 | 16 | 18 | 19 | 22 |
| 300m | 18 | 15 | 10 | 11 | 14 | 16 | 16 | 20 |
| Valley | 19 | 16 | 11 | 12 | 15 | 16 | 16 | 21 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-2°
|
-2°
|
-3°
|
-2°
|
-1°
|
0°
|
0°
|
1°
|
| 600m |
0°
|
0°
|
-1°
|
1°
|
2°
|
2°
|
2°
|
3°
|
| 300m |
2°
|
2°
|
2°
|
4°
|
5°
|
5°
|
5°
|
5°
|
| Valley |
4°
|
4°
|
3°
|
5°
|
6°
|
7°
|
6°
|
6°
|
| Freezing Level |
600m
|
500m
|
300m
|
500m
|
600m
|
600m
|
800m
|
1,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-10°
|
-10°
|
-10°
|
-8°
|
-6°
|
-6°
|
-7°
|
-6°
|
| 600m |
-5°
|
-5°
|
-5°
|
-4°
|
-2°
|
-2°
|
-3°
|
-2°
|
| 300m |
-1°
|
-1°
|
-1°
|
1°
|
2°
|
2°
|
2°
|
1°
|
| Valley |
0°
|
1°
|
1°
|
3°
|
4°
|
4°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
A fair morning but a risk of sunburn either side of noon and cloud lowering to summits later in the day.
Weather
Showers overnight gradually dying away. Largely dry with brighter spells through the morning. Cloud gradually feeding from the west through the afternoon and evening to bring some patchy rain and initially summit snow.
Chance of cloud-free hill tops
90% plus becoming 70% by late afternoon
Low cloud and visibility
Good or very good, becoming moderate or poor in rain, very poor in snow and within cloud with bases becoming occasional down to 600m by late afternoon
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Periods of rain turning heavy at times, clearing to scattered showers and brighter spells from early afternoon. Strong summit winds.
Chance of cloud-free hill tops
10% or less becoming 65% by mid-afternoon
Maximum wind speed expected
West or southwest 20-30mph with gusts reaching 45mph at times across most exposed ridges and summits.
Temperature
- At 800m Plus 4 Celsius decreasing 1 Celsius during the evening
- Valley Plus 6 Celsius increasing 12 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 with bases extensive from 500m at first before lifting and breaking during the afternoon
Mountain weather information
Sat 28 Mar
Sunrise:
Sunset:
Scattered showers and brighter spells, brought on strong to gale westerly summit winds. Freezing level 700-900m.
Sun 29 Mar
Sunrise:
Sunset:
Rain at first, occasionally heavy, clearing to showers late in the day. Strong to gale summit winds. Freezing level above the summits.
Mon 30 Mar
Sunrise:
Sunset:
Rather cloudy with some patchy light rain. Strong to gale winds. Freezing level above the 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.