Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High in overall theme. Low for shower risk into the weekend.
This evening forecast
Dry and bright to end the day with sunshine turning hazy at times. Blustery easterly winds.
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
A fine and dry day with plenty of sunshine.
| 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
36
|
SE
33
|
E
29
|
E
30
|
E
23
|
E
21
|
E
22
|
E
23
|
| 600m |
SE
23
|
SE
18
|
SE
19
|
SE
17
|
SE
17
|
SE
14
|
SE
12
|
E
11
|
| 300m |
SE
17
|
SE
11
|
SE
15
|
SE
14
|
SE
13
|
SE
11
|
SE
9
|
E
7
|
| Valley |
SE
17
|
SE
11
|
SE
15
|
SE
14
|
SE
13
|
SE
11
|
SE
9
|
SE
7
|
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 | 46 | 42 | 37 | 38 | 31 | 28 | 29 | 31 |
| 600m | 38 | 32 | 31 | 28 | 26 | 21 | 20 | 23 |
| 300m | 35 | 26 | 29 | 25 | 23 | 19 | 19 | 18 |
| Valley | 34 | 26 | 29 | 24 | 22 | 18 | 19 | 18 |
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°
|
4°
|
5°
|
8°
|
10°
|
9°
|
7°
|
| 600m |
6°
|
7°
|
7°
|
8°
|
11°
|
13°
|
12°
|
10°
|
| 300m |
7°
|
7°
|
7°
|
10°
|
14°
|
16°
|
14°
|
11°
|
| Valley |
8°
|
8°
|
8°
|
11°
|
15°
|
17°
|
16°
|
12°
|
| Freezing Level |
1,300m
|
1,300m
|
1,300m
|
1,300m
|
1,400m
|
1,500m
|
1,500m
|
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 |
-4°
|
-2°
|
-2°
|
-1°
|
3°
|
6°
|
5°
|
3°
|
| 600m |
2°
|
2°
|
3°
|
4°
|
8°
|
10°
|
9°
|
7°
|
| 300m |
4°
|
4°
|
3°
|
7°
|
11°
|
13°
|
12°
|
9°
|
| Valley |
5°
|
5°
|
4°
|
9°
|
12°
|
14°
|
14°
|
10°
|
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 will require able sun protection.
Weather
Potential for some patchy cloud around through the first few hours of Thursday, this has the potential to bring isolated misty conditions to eastern facing slopes. This is expected to quickly clear soon after dawn leaving a day of dry conditions and plenty of sunshine. Sunshine may be hazy at times through the afternoon.
Chance of cloud-free hill tops
80% rising to 100% through the morning.
Low cloud and visibility
Limited amounts of cloud between 400-600m at first, mainly confined to eastward facing slopes, in the east of the park. Once the sun rises this should quickly clear to leave cloud free summits by mid-morning. Visibility will be very poor or poor in mist/low cloud at first but otherwise very good visibility giving views to distant peaks.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A similar day ahead with patchy cloud clearing to leave a sunny day, cloud less extensive than previous night. Lighter winds than previous days, though still a moderate to fresh easterly on the hills. Feeling warmer with freezing level above summits.
Chance of cloud-free hill tops
80% rising to 100%.
Maximum wind speed expected
Southeasterly 20-25mph.
Temperature
- At 800m Plus 5 Celsius rising to Plus 13 Celsius.
- Valley Plus 10 Celsius rising to Plus 19 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Patchy cloud 400-600m at first, mainly confined to eastward facing slopes. This will clear quickly leaving a dry and bright day to follow with cloud free summits. Visibility will be very poor or poor in mist/low cloud at first but otherwise very good visibility giving views to distant peaks.
Mountain weather information
Sat 25 Apr
Sunrise:
Sunset:
Another fine and dry day once any valley mist and fog has cleared. Sunshine turning hazier at times through the day. Winds continuing to ease, with just a gentle southeasterly breeze on the hills. Freezing level above the summits.
Sun 26 Apr
Sunrise:
Sunset:
A cloudier day overall, though all of this largely above the summits and still with the potential of some bright spells to break through. The small chance of patchy rain, but most of the day should be dry. Light southeasterly winds and freezing level above the summits.
Mon 27 Apr
Sunrise:
Sunset:
Another rather settled day ahead although with more in the way of patchy cloud around at times. Light to moderate easterly winds. Freezing levels 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.