Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High in general themes, moderate on precise location of showers on Monday and extent of cloud cover throughout.
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.
Mountain weather forecast
Another fine and dry start with showers developing later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
<05% | <05% | 10% | 20% | 40% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
E
13
|
SE
7
|
S
5
|
NE
6
|
E
8
|
E
17
|
| 600m |
SE
8
|
SE
5
|
NW
5
|
N
6
|
NE
5
|
E
8
|
| 300m |
SE
5
|
SE
4
|
N
4
|
N
5
|
NE
4
|
E
6
|
| Valley |
SE
4
|
SE
4
|
NW
5
|
N
6
|
NE
5
|
E
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 17 | 10 | 8 | 9 | 11 | 23 |
| 600m | 12 | 7 | 7 | 9 | 7 | 14 |
| 300m | 11 | 7 | 7 | 8 | 6 | 13 |
| Valley | 11 | 6 | 7 | 8 | 7 | 13 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
3°
|
5°
|
4°
|
4°
|
3°
|
| 600m |
4°
|
5°
|
7°
|
7°
|
7°
|
6°
|
| 300m |
6°
|
8°
|
10°
|
9°
|
9°
|
8°
|
| Valley |
6°
|
10°
|
11°
|
11°
|
10°
|
9°
|
| Freezing Level |
800m
|
1,000m
|
1,100m
|
1,200m
|
1,200m
|
1,200m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-2°
|
0°
|
3°
|
2°
|
1°
|
-2°
|
| 600m |
2°
|
4°
|
6°
|
5°
|
5°
|
3°
|
| 300m |
4°
|
7°
|
9°
|
8°
|
8°
|
6°
|
| Valley |
5°
|
9°
|
10°
|
10°
|
10°
|
7°
|
Additional weather information
Meteorologist's view
An excellent day for any outdoor activities with plenty of sunshine to begin and with most areas remaining dry. Moderate UV should be considered with sun protection suggested. Despite UV and sunshine, temperatures will still be rather low with feels like temperatures near freezing at times, therefore warm layers are suggested.
Weather
A dry and fine start to the day as high pressure continues to dominate across the area. Any localised mist or fog patches in the valleys will likely clear away soon after dawn. Fair weather cloud likely to develop through the morning with increased cloud pushing in from the east later. There is the potential for showers through the late afternoon, and evening.
Chance of cloud-free hill tops
95% dropping to 80% through the afternoon as patchy cloud drifts close to the height of the summits.
Low cloud and visibility
Any mist or fog patches in valleys may briefly lift to 400-600m before clearing. Apart from this very good or excellent visibilities are expected with views to distant summits likely. Visibilities will be poor or very poor to begin in mist and fog patches, and may dip to good or moderate in any showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy to start the day, cloud shrouding the highest peak to begin. Cloud then clears westward through the morning leaving a dry and bright afternoon with plenty of sunshine.
Chance of cloud-free hill tops
30% initially rising to 90% through the morning as cloud lift and breaks.
Maximum wind speed expected
Easterly 30-40mph.
Temperature
- At 800m Minus 1 Celsius rising to Plus 5 Celsius.
- Valley Plus 4 Celsius rising to Plus 13 Celsius.
- Freezing level 700m initially rising above summits through the morning.
Low cloud and visibility
Cloud bases initially at 400-600m, leading to widespread hill fog but with highest peaks potentially above the cloud layer. Cloud then lifts and breaks through the morning rising above summits. Visibility initially very poor in any hill fog but very good or good away from this. Visibilities becoming very good or excellent through the afternoon with views of distant peaks possible.
Mountain weather information
Wed 22 Apr
Sunrise:
Sunset:
Patchy cloud around Wednesday morning, quickly clearing to leave a fine and dry day with plenty of sunshine. Strong to gale force easterly winds especially over high ground with a significant wind chill. Freezing level 800-1000m initially, rising above summits.
Thu 23 Apr
Sunrise:
Sunset:
Another day with some patchy cloud to start though less widespread than on Wednesday, once again quickly clearing to leave a fine and dry day with plenty of sunshine. Winds easing slightly to a fresh to strong easterly. Freezing level above summits.
Fri 24 Apr
Sunrise:
Sunset:
A similar day ahead with patchy cloud clearing to leave a sunny day. Much lighter winds than previous days, generally light to moderate easterly. 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.