Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence in unsettled conditions continuing but lower confidence in details for Friday with a frontal band of cloud and rain expected to stall across the area. High confidence for some brighter conditions on Saturday but turning quite wet and windy on Sunday again.
This evening forecast
Cloudy with outbreaks of rain through the evening. Strong southwesterly winds easing during the evening.
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
A cloudy day with periods of rain in the morning, drier in the north, a few dry spells in the afternoon for all, feeling cool in fresh northwesterly winds.
| 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) |
60% | 70% | 60% | 60% | 40% | 40% | 40% | 40% |
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
18
|
W
13
|
N
10
|
N
15
|
N
16
|
N
19
|
N
22
|
N
21
|
| 600m |
S
11
|
S
7
|
NW
5
|
N
10
|
N
12
|
N
14
|
N
12
|
N
10
|
| 300m |
S
6
|
SE
4
|
NW
3
|
N
6
|
N
9
|
N
10
|
N
7
|
NW
6
|
| Valley |
S
6
|
SE
4
|
NW
3
|
NW
6
|
N
9
|
N
10
|
N
7
|
NW
6
|
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 | 21 | 15 | 13 | 18 | 20 | 24 | 27 | 27 |
| 600m | 13 | 9 | 8 | 13 | 16 | 19 | 16 | 15 |
| 300m | 11 | 6 | 6 | 11 | 15 | 17 | 14 | 13 |
| Valley | 11 | 5 | 6 | 10 | 15 | 17 | 14 | 13 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
4°
|
3°
|
3°
|
2°
|
2°
|
2°
|
1°
|
0°
|
| 600m |
6°
|
5°
|
5°
|
4°
|
4°
|
4°
|
3°
|
2°
|
| 300m |
8°
|
7°
|
7°
|
6°
|
7°
|
6°
|
6°
|
5°
|
| Valley |
10°
|
8°
|
8°
|
8°
|
8°
|
8°
|
7°
|
6°
|
| Freezing Level |
1,300m
|
1,300m
|
1,300m
|
1,200m
|
1,100m
|
1,000m
|
900m
|
900m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-1°
|
-1°
|
-1°
|
-3°
|
-3°
|
-4°
|
-6°
|
-6°
|
| 600m |
3°
|
3°
|
3°
|
1°
|
1°
|
-1°
|
-1°
|
-2°
|
| 300m |
7°
|
6°
|
6°
|
4°
|
4°
|
3°
|
3°
|
2°
|
| Valley |
8°
|
7°
|
7°
|
6°
|
6°
|
5°
|
5°
|
4°
|
Additional weather information
Meteorologist's view
A cool feel to the day on Friday with a fresher northwesterly airstream and freezing level lowering towards summit heights during the day.
Weather
A cloudy day with outbreaks of rain and drizzle, some of the northern mountains may remain dry with some bright or sunny spells here but further south the cloud and outbreaks of rain are likely to persist for much of the day, turning wintry on the highest tops. During the afternoon even southern areas should experience some drier spells. Quite a fresh, cool feel to the day with northwesterly winds.
Chance of cloud-free hill tops
80% in the north, 40% further south.
Low cloud and visibility
In the north scattered layers of low cloud above 400m early in the day will lift and clear but a few patches may linger around for much of the day. Over southern mountains broken cloud layer above 400m may be quite persistent for much of the day. Visibility will be good or very good in the north away from the rain but will be moderate or poor at times further south in the wetter conditions.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A mostly dry day with sunny spells, a few light showers are possible, wintry on the higher mountains, and turning cloudier at times but a fair day for the end of February. A band of rain will spread across the area later in the day but it looks as if this will be towards the evening.
Chance of cloud-free hill tops
70%
Maximum wind speed expected
Northerly 10mph becoming Southwesterly 10-15mph gusts 25mph.
Temperature
- At 800m Plus 1 Celsius
- Valley Plus 2 rising to 7 Celsius.
- Freezing level 900m
Low cloud and visibility
Patchy low cloud at times above 600m may affect summits in the morning but tending to lift above all summits in the afternoon. Visibility generally good or very good for the Snowdonia area.
Mountain weather information
Sun 1 Mar
Sunrise:
Sunset:
A wet and windy start on Sunday with rain through the morning, a few drier spells possible in the afternoon, strong southwesterly winds expected, possibly summit gales.
Mon 2 Mar
Sunrise:
Sunset:
Strong westerly winds and periods of rain expected, some uncertainty on timings, potentially a brighter, drier afternoon. Feeling colder on Monday.
Tue 3 Mar
Sunrise:
Sunset:
A dry and bright day is possible with light winds, low confidence.
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.