Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for a cold, initially windy, but mainly dry day Monday but lower for cloud details Tuesday and timing of the rain Wednesday and details generally thereafter.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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
Mainly dry with sunny spells. Strong winds easing
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | 10% | <05% | <05% | <05% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
NW
37
|
NW
33
|
NW
31
|
NW
30
|
NW
27
|
NW
24
|
| 600m |
NW
25
|
NW
26
|
NW
23
|
NW
23
|
NW
17
|
W
13
|
| 300m |
NW
17
|
NW
19
|
NW
18
|
NW
17
|
NW
11
|
W
5
|
| Valley |
NW
17
|
NW
19
|
NW
18
|
NW
17
|
NW
11
|
W
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 44 | 42 | 39 | 39 | 34 | 29 |
| 600m | 31 | 34 | 30 | 31 | 22 | 17 |
| 300m | 28 | 30 | 28 | 27 | 19 | 12 |
| Valley | 28 | 30 | 28 | 27 | 20 | 13 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
0°
|
1°
|
2°
|
2°
|
2°
|
| 600m |
2°
|
3°
|
4°
|
5°
|
5°
|
5°
|
| 300m |
5°
|
6°
|
7°
|
8°
|
7°
|
7°
|
| Valley |
6°
|
7°
|
8°
|
9°
|
9°
|
8°
|
| Freezing Level |
800m
|
800m
|
900m
|
1,000m
|
1,100m
|
2,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
-9°
|
-8°
|
-7°
|
-5°
|
-5°
|
-4°
|
| 600m |
-4°
|
-4°
|
-2°
|
-1°
|
0°
|
1°
|
| 300m |
0°
|
1°
|
2°
|
4°
|
4°
|
5°
|
| Valley |
2°
|
3°
|
4°
|
6°
|
6°
|
7°
|
Additional weather information
Meteorologist's view
Gusts around 50mph over higher ridges and summits easing around or soon after dawn.
Weather
Clear spells and a few showers overnight, these falling wintry above about 750m. Then a bright, cold morning with sunny spells and perhaps the odd shower, wintry above about 750m, moving through quickly on the strong winds, but most places dry. The afternoon looks dry with good spells of sunshine before cloud increases through the evening, with outbreaks of light rain and drizzle developing towards midnight.
Chance of cloud-free hill tops
Around 75% becoming close to 100% by early-afternoon, chances fall again later in the evening.
Low cloud and visibility
Occasional or periods of cloud above about 750-900m through the morning then lifting above the summits in the afternoon, then becoming periods or persistent cloud above 600m towards midnight. Away from cloud visibility very good, with some good panoramic views of surrounding hills, falling briefly in any showers and several kilometres in rain and drizzle later in evening.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A mostly cloudy morning with outbreaks of mainly light rain and drizzle, most persistent across western hills with the best of any clearer or brighter spells across the east. It gradually becomes drier through the afternoon with cloud lifting and breaking
Chance of cloud-free hill tops
Little chance in west, but around 40% in east, through the morning improving to 75% through the afternoon.
Maximum wind speed expected
Westerly 20mph gradually easing and backing more southwesterly 10-15mph
Temperature
- At 800m Around plus 4 Celsius rising to plus 7 or 8 Celsius
- Valley Around plus 6 or 7 Celsius at dawn rising to plus 13 or 14 Celsius by day
- Freezing level Above the summits
Low cloud and visibility
Periods or persistent cloud above 450-600m, with patches below, but more occasional above 600-750m at times in the east, becoming occasional above 600-750m generally through the afternoon. Away from cloud visibility good falling to several kilometres in rain and drizzle.
Mountain weather information
Wed 1 Apr
Sunrise:
Sunset:
Cloudy with outbreaks of rain, perhaps heavier in the evening, becoming mainly dry with clearer spells overnight. Fresh southwesterly winds turning northerly and easing. Freezing level falling to 900m later.
Thu 2 Apr
Sunrise:
Sunset:
Probably dry with bright spells at first but outbreaks of rain spreading east in evening. Mainly light and variable winds, becoming southerly later. Freezing level falling to 600m for a time.
Fri 3 Apr
Sunrise:
Sunset:
Rain and summit snow clearing easing, then drier for a time but heavy rain may spread from the west later. Generally light to moderate and variable winds at first but a strengthening southerly wind later. Freezing level 900m falling to 600m, rising again later.
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.