Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for a lot of fine weather next few days. Some uncertainty about cloud amounts, though some very warm sunshine possible Tuesday and Wednesday. Moderate confidence for the timing of a rain band clearing through Wednesday night, introducing cooler more changeable conditions later in the week.
This evening forecast
Small chance of a light shower at first this evening, otherwise fine with clear spells. Breezy near the summit.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Early frost. Becoming sunny. Breezy.
| 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% | 10% | 10% | 10% | <05% | 00% | 00% | 00% |
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 |
SW
16
|
S
18
|
S
22
|
S
23
|
S
22
|
S
18
|
S
20
|
SE
24
|
| 600m |
S
10
|
S
13
|
S
14
|
S
20
|
S
19
|
S
17
|
S
11
|
SE
16
|
| 300m |
S
6
|
S
7
|
S
8
|
S
13
|
S
14
|
S
12
|
SE
6
|
SE
10
|
| Valley |
S
6
|
S
7
|
S
8
|
S
13
|
S
13
|
S
11
|
SE
6
|
SE
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 | 20 | 22 | 27 | 29 | 29 | 24 | 26 | 31 |
| 600m | 14 | 17 | 20 | 26 | 26 | 23 | 18 | 26 |
| 300m | 12 | 15 | 17 | 22 | 23 | 20 | 13 | 21 |
| Valley | 12 | 15 | 17 | 21 | 22 | 19 | 13 | 22 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
0°
|
1°
|
4°
|
6°
|
7°
|
6°
|
| 600m |
2°
|
2°
|
2°
|
4°
|
6°
|
9°
|
9°
|
8°
|
| 300m |
4°
|
4°
|
4°
|
7°
|
9°
|
12°
|
11°
|
9°
|
| Valley |
5°
|
5°
|
6°
|
8°
|
11°
|
13°
|
12°
|
10°
|
| Freezing Level |
800m
|
900m
|
900m
|
900m
|
1,100m
|
1,500m
|
1,600m
|
1,800m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-6°
|
-6°
|
-6°
|
-5°
|
-2°
|
2°
|
2°
|
1°
|
| 600m |
-2°
|
-2°
|
-2°
|
-1°
|
2°
|
5°
|
6°
|
5°
|
| 300m |
2°
|
2°
|
2°
|
3°
|
6°
|
9°
|
10°
|
6°
|
| Valley |
3°
|
3°
|
3°
|
5°
|
8°
|
11°
|
11°
|
7°
|
Additional weather information
Meteorologist's view
Any early low cloud/fog will give difficult conditions for navigating on the hill tops. It will be cold and often breezy near the summit too, so warm clothing is advised.
Weather
Dry. A cold start with some frost. Areas of cloud could lower onto the hill tops to give some patches of mist or fog at first, but cloud lifting during the morning, and skies clearing heading into the afternoon and for the evening. Breezy at times, especially on the hill tops.
Chance of cloud-free hill tops
60% at first, rising to 90% or more during the day.
Low cloud and visibility
Poor visibility at first where any low cloud gives mist/fog patches on the hill tops, otherwise good to very good visibility, becoming excellent at times.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry and sunny, though chilly at first. Cloud gradually increasing during the day, though much of it medium or high level cloud, so sunshine just turning hazy. Breezy at first, and fairly windy near the summits, though south to southeasterly winds gradually easing. Becoming very warm in the sunshine.
Chance of cloud-free hill tops
80% or more.
Maximum wind speed expected
South to southeasterly 25 to 30mph with gusts 35 to 40mph, slowly easing, to become a light breeze later.
Temperature
- At 800m PS04C rising to PS13C.
- Valley PS06C rising to PS20C.
- Freezing level Above the summits throughout.
Low cloud and visibility
Low cloud not expected, with visibility mostly very good.
Mountain weather information
Wed 8 Apr
Sunrise:
Sunset:
Mostly dry. Early bright spells, and becoming warm when the sun appears. Then cloud slowly thickening. Some fog on hill tops later, and rain overnight reducing visibility. Light winds, freshening overnight. Freezing levels above summits throughout.
Thu 9 Apr
Sunrise:
Sunset:
Early rain clearing to a colder, brighter but rather windy day with sunshine and showers. Freezing levels lowering to around 700 metres, with some of the showers turning wintry near the summits.
Fri 10 Apr
Sunrise:
Sunset:
Rather cloudy with patchy rain, and becoming windy for a time. Freezing levels climbing back 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.