Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for changeable weather to continue over the weekend and into next week. Low confidence for detail of rainfall on a daily basis.
This evening forecast
Variable amounts of cloud and a chance of passing showers, these falling as sleet or wet snow on the very highest tops. Cold, strong southerly winds. Patchy cloud down to 800 metres.
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.
Mountain weather forecast
Cold, windy and mainly dry
| 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) |
20% | 20% | 20% | 20% | 20% | 20% | 20% | 20% |
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 |
SE
26
|
SE
23
|
SE
21
|
SE
23
|
SE
22
|
SE
19
|
SE
19
|
SE
19
|
| 600m |
SE
18
|
SE
16
|
SE
15
|
SE
16
|
SE
16
|
SE
14
|
SE
12
|
SE
12
|
| 300m |
SE
12
|
SE
11
|
SE
10
|
SE
10
|
SE
10
|
SE
9
|
SE
8
|
SE
7
|
| Valley |
SE
12
|
SE
11
|
SE
10
|
SE
11
|
SE
11
|
SE
9
|
SE
9
|
SE
9
|
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 | 33 | 29 | 27 | 29 | 28 | 25 | 24 | 24 |
| 600m | 26 | 22 | 21 | 23 | 22 | 19 | 19 | 18 |
| 300m | 24 | 21 | 20 | 21 | 20 | 17 | 16 | 16 |
| Valley | 23 | 21 | 20 | 21 | 21 | 18 | 18 | 19 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
1°
|
0°
|
0°
|
0°
|
1°
|
2°
|
0°
|
0°
|
| 600m |
3°
|
3°
|
2°
|
2°
|
3°
|
4°
|
2°
|
2°
|
| 300m |
5°
|
4°
|
4°
|
4°
|
6°
|
6°
|
4°
|
4°
|
| Valley |
6°
|
5°
|
5°
|
5°
|
7°
|
8°
|
5°
|
5°
|
| Freezing Level |
1,000m
|
1,000m
|
900m
|
900m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
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°
|
-6°
|
-5°
|
-4°
|
-6°
|
-6°
|
| 600m |
-2°
|
-2°
|
-2°
|
-3°
|
-1°
|
0°
|
-2°
|
-2°
|
| 300m |
1°
|
1°
|
0°
|
0°
|
2°
|
4°
|
1°
|
1°
|
| Valley |
2°
|
2°
|
2°
|
2°
|
4°
|
5°
|
2°
|
2°
|
Additional weather information
Meteorologist's view
Strong winds at height will make for slow progress and significant wind chill.
Weather
Chance of showers across the west of the Park during the early hours. Otherwise it will be a largely dry with variable cloud cover, the east of the Park may see a passing shower around the middle of the day.
Chance of cloud-free hill tops
70%
Low cloud and visibility
Generally good visibility with some patchy cloud around 700 metres, this most extensive first thing in the morning
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Most of the day will be dry with variable cloud cover but a chance of rain and higher summit sleet or snow extending from the east later in the day. Cold southeasterly summit winds.
Chance of cloud-free hill tops
70
Maximum wind speed expected
Southeasterly 20 mph
Temperature
- At 800m Plus 2 Celsius
- Valley Minus 3 rising to 7 Celsius
- Freezing level Above summits
Low cloud and visibility
Poor in areas of cloud between 200 and 500 metres, this tending to clear through the afternoon although may become more extensive down to 600 metres should rain arrive from the east in the afternoon.
Mountain weather information
Mon 19 Jan
Sunrise:
Sunset:
Rain will spread from the west for a time in the morning. Colder, drier weather following on through the afternoon. Further rain may spread northeast through the evening.
Tue 20 Jan
Sunrise:
Sunset:
Cloudy and windy with rain at times.
Wed 21 Jan
Sunrise:
Sunset:
Remaining windy with the chance of further spells of rain.
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.