Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High in general but moderate for cloud cover later in the weekend.
This evening forecast
Dry and bright conditions persisting and plenty of evening sunshine.
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.
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.
Mountain weather forecast
Another settled day with plenty of sunshine and light to moderate 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) |
<05% | <05% | <05% | <05% | <05% | <05% | <05% | <05% |
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 |
E
20
|
SE
17
|
SE
14
|
SE
11
|
SE
8
|
SE
9
|
SE
9
|
SE
11
|
| 600m |
SE
9
|
SE
11
|
SE
7
|
SE
4
|
E
5
|
SE
7
|
S
5
|
SE
7
|
| 300m |
SE
6
|
SE
8
|
E
5
|
NE
3
|
E
4
|
SE
6
|
SE
3
|
SE
5
|
| Valley |
SE
7
|
SE
8
|
SE
5
|
E
3
|
E
4
|
SE
6
|
SE
3
|
SE
6
|
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 | 26 | 22 | 17 | 14 | 12 | 13 | 12 | 14 |
| 600m | 19 | 17 | 11 | 7 | 9 | 11 | 8 | 11 |
| 300m | 17 | 17 | 10 | 5 | 7 | 9 | 6 | 9 |
| Valley | 17 | 17 | 11 | 5 | 7 | 9 | 6 | 10 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
8°
|
8°
|
8°
|
10°
|
11°
|
12°
|
10°
|
8°
|
| 600m |
10°
|
10°
|
10°
|
12°
|
14°
|
14°
|
13°
|
10°
|
| 300m |
10°
|
10°
|
10°
|
14°
|
16°
|
17°
|
15°
|
11°
|
| Valley |
11°
|
10°
|
11°
|
15°
|
18°
|
18°
|
16°
|
12°
|
| Freezing Level |
1,500m
|
1,400m
|
1,300m
|
1,300m
|
1,300m
|
1,500m
|
1,500m
|
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 |
4°
|
4°
|
5°
|
7°
|
9°
|
10°
|
9°
|
5°
|
| 600m |
8°
|
7°
|
8°
|
11°
|
12°
|
13°
|
12°
|
8°
|
| 300m |
9°
|
8°
|
9°
|
13°
|
15°
|
16°
|
15°
|
10°
|
| Valley |
10°
|
8°
|
9°
|
14°
|
16°
|
17°
|
16°
|
11°
|
Additional weather information
Meteorologist's view
A pleasant day for any outdoor activities with plenty of dry and bright weather. Feeling rather cold at first with brisk winds so warmer layers are suggested. Clear skies and plenty of sunshine, accompanied with High UV levels, mean that sun protection should be considered.
Weather
Patchy low cloud likely to the extreme east of the park at first, with the potential for some mist of fog patches in sheltered valleys. These are likely to clear quickly to leave a day of dry and fine weather, with plenty of sunshine.
Chance of cloud-free hill tops
80% soon rising to 100%.
Low cloud and visibility
Patchy low between 300-500m at first, confined to the extreme east of the park, and a low risk of some fog in sheltered valleys. After dawn these should quickly clear to leave cloud free summits by mid-morning. Visibility will be very poor or poor in any low cloud or fog initially but very good otherwise with views over distant peaks.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another dry and bright day ahead with plenty of sunshine. Skies may turn hazy or milky at times through the afternoon. Winds continuing to ease becoming a light to moderate southeasterly.
Chance of cloud-free hill tops
95%
Maximum wind speed expected
Southeasterly 10-20mph.
Temperature
- At 800m Plus 3 Celsius rising to Plus 11 Celsius.
- Valley Plus 9 Celsius rising to Plus 17 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Potential for some mist and fog in sheltered valleys at first which should quickly lift once the sun rises. Visibility will be poor or very poor in any mist or fog at first but excellent otherwise, with views over distant peaks likely.
Mountain weather information
Sun 26 Apr
Sunrise:
Sunset:
A somewhat cloudier day with hazy sunshine likely throughout and patchy lower level cloud around at times. Clouds largely all above summits. Gentle to moderate southeasterly winds. Freezing level above summits.
Mon 27 Apr
Sunrise:
Sunset:
Another settled day with bright or sunny spells as fair weather cloud develops over high ground. Gentle to moderate easterly winds and freezing level above summits.
Tue 28 Apr
Sunrise:
Sunset:
Another similar day ahead with bright conditions to start and some patchy cloud developing through the afternoon. 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.