Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
A dry and settled day on Tuesday before a return to unsettled, wet conditions on Wednesday and Thursday, with strong southwesterly winds and some localised flooding possible. Uncertainty towards the end of the week but strong winds and further rain likely.
This evening forecast
A cloudy evening with light northwesterly winds, risk of a few showers early on but drier later with clear spells developing.
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.
Mountain weather forecast
A dry and bright day with sunny spells and mainly light 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) |
10% | 10% | <05% | <05% | <05% | <05% | <05% | <05% |
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 |
NW
14
|
NW
16
|
NW
15
|
W
14
|
W
13
|
SW
15
|
SW
16
|
S
21
|
| 600m |
NW
6
|
NW
8
|
NW
8
|
W
6
|
SW
8
|
SW
10
|
S
12
|
S
15
|
| 300m |
NW
3
|
NW
4
|
NW
3
|
SW
2
|
SW
3
|
SW
5
|
S
6
|
S
9
|
| Valley |
NW
3
|
NW
4
|
W
3
|
SW
3
|
SW
4
|
SW
5
|
S
7
|
S
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 | 18 | 19 | 18 | 16 | 16 | 18 | 20 | 26 |
| 600m | 9 | 12 | 11 | 8 | 10 | 13 | 15 | 19 |
| 300m | 7 | 10 | 8 | 5 | 6 | 11 | 13 | 17 |
| Valley | 8 | 10 | 8 | 5 | 7 | 12 | 13 | 18 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
2°
|
1°
|
1°
|
0°
|
1°
|
1°
|
0°
|
1°
|
| 600m |
4°
|
3°
|
3°
|
3°
|
3°
|
3°
|
2°
|
2°
|
| 300m |
6°
|
5°
|
5°
|
4°
|
6°
|
5°
|
4°
|
4°
|
| Valley |
7°
|
6°
|
6°
|
5°
|
7°
|
7°
|
5°
|
5°
|
| Freezing Level |
1,000m
|
1,000m
|
900m
|
900m
|
900m
|
900m
|
800m
|
900m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-4°
|
-4°
|
-5°
|
-5°
|
-4°
|
-5°
|
-5°
|
-6°
|
| 600m |
1°
|
0°
|
0°
|
0°
|
0°
|
0°
|
-2°
|
-2°
|
| 300m |
5°
|
4°
|
4°
|
3°
|
4°
|
4°
|
2°
|
1°
|
| Valley |
6°
|
5°
|
5°
|
4°
|
6°
|
5°
|
3°
|
2°
|
Additional weather information
Meteorologist's view
Nothing to add.
Weather
Clear spells overnight and perhaps a frost in some glens. A mostly dry day with plenty of winter sunshine. Still feeling cool out on the hills.
Chance of cloud-free hill tops
90%
Low cloud and visibility
Patches of low cloud early in the morning around 7-800m, perhaps lingering around northern hills during the morning. Good visibility expected.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry overnight but low cloud gathering as a band of rain spreads across the Snowdonia during the morning, becoming persistent and heavy at times during the day. The rain will be accompanied but strong southerly winds, gales likely in the afternoon. Rain easing during the evening
Chance of cloud-free hill tops
80% falling to 30% associated with rain.
Maximum wind speed expected
Southerly 25-30mph with gusts 40-45mph
Temperature
- At 800m Plus 2 rising to 5 Celsius.
- Valley Plus 6 Celsius rising to 11 Celsius.
- Freezing level 1000m rising above all summits.
Low cloud and visibility
Patchy cloud above 600m will become scattered or broken during the morning over the tops, cloud bases will lower during the day, particularly around western mountains. Cloud overcast layers above 400m during the afternoon. Visibility will be good around dawn but becoming moderate or poor in rain later.
Mountain weather information
Thu 18 Dec
Sunrise:
Sunset:
Dry for a time in the morning but early mist and low cloud will be persistent. Further rain expected by mid-morning becoming persistent and heavy at times for a few hours, perhaps turning wintry on the higher tops during the evening as freezing level lowers to 900m. Fresh southwesterly winds expected.
Fri 19 Dec
Sunrise:
Sunset:
A drier day with sunny spells, strong southwesterly winds are likely, rain expected during the evening. Freezing level around 1000m
Sat 20 Dec
Sunrise:
Sunset:
Strong southwesterly winds, risk of gales, bands of rain likely, perhaps turning wintry on the tops.
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.