Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Confidence generally high for the next few days but lower for cloud details. There is also some uncertainty in the timing of the rain clearing southeast on Tuesday and for rain arriving later on Thursday.
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.
Mountain weather forecast
Mostly cloudy with occasional rain in afternoon. Light winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
00% | 20% | 30% | 20% | 60% | 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 |
W
11
|
NW
12
|
NW
10
|
NW
12
|
N
19
|
N
28
|
| 600m |
SW
6
|
NW
6
|
NW
8
|
NW
10
|
N
12
|
N
14
|
| 300m |
SW
2
|
NW
5
|
NW
6
|
NW
7
|
N
8
|
N
9
|
| Valley |
SW
2
|
NW
5
|
NW
6
|
NW
7
|
N
8
|
N
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 13 | 14 | 13 | 15 | 24 | 35 |
| 600m | 7 | 8 | 10 | 13 | 16 | 22 |
| 300m | 4 | 8 | 9 | 11 | 15 | 20 |
| Valley | 4 | 8 | 9 | 11 | 15 | 20 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
4°
|
3°
|
3°
|
4°
|
3°
|
1°
|
| 600m |
5°
|
5°
|
5°
|
6°
|
5°
|
3°
|
| 300m |
6°
|
7°
|
7°
|
8°
|
7°
|
6°
|
| Valley |
6°
|
8°
|
9°
|
9°
|
8°
|
7°
|
| Freezing Level |
900m
|
1,100m
|
1,600m
|
2,100m
|
1,500m
|
900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
-1°
|
-1°
|
0°
|
-2°
|
-7°
|
| 600m |
3°
|
2°
|
2°
|
3°
|
2°
|
-1°
|
| 300m |
5°
|
5°
|
6°
|
6°
|
5°
|
3°
|
| Valley |
5°
|
6°
|
7°
|
8°
|
6°
|
4°
|
Additional weather information
Meteorologist's view
Generally good hillwalking conditions on Sunday, but be prepared for some wetter conditions and more extensive low cloud later in the afternoon.
Weather
A cloudy but dry start then occasional rain from late morning, perhaps drier in the afternoon before further rain later in the afternoon and in and early evening. Rain clearing away southeast during the evening with skies clearing.
Chance of cloud-free hill tops
70%, becoming 20% for a time late afternoon to early evening.
Low cloud and visibility
Patchy cloud above 600m, mainly in the southwest. Cloud becoming more extensive above 400 or 500m late in the afternoon before clearing during evening. Away from low cloud, visibility mainly good but falling to a few km at times in rain.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A clear night with a frost then a dry and bright day with hazy sunny spells. Cloud thickening towards evening with some patchy light rain arriving from the west.
Chance of cloud-free hill tops
90%, becoming 30% in evening.
Maximum wind speed expected
Northwest 5-10mph increasing Southwest 20 to 25mph gusts 35mph later.
Temperature
- At 800m Minus 1C rising to 3C.
- Valley 0C rising to 9 or 10C.
- Freezing level 600m rising to 800m, then above summits in evening.
Low cloud and visibility
Mainly good visibility. Becoming poor at times towards evening with areas of cloud developing above 600m.
Mountain weather information
Tue 24 Mar
Sunrise:
Sunset:
Outbreaks of rain, heavy at times, clearing southeast during the afternoon. Colder conditions following with showers, these turning wintry. Strong to gale force southwest winds becoming northwesterly. Freezing level above summits, falling to 700m later.
Wed 25 Mar
Sunrise:
Sunset:
A much colder day with bright spells and a few sleet or snow showers. Strong northwesterly winds and a severe wind chill. Freezing level 500m.
Thu 26 Mar
Sunrise:
Sunset:
Wintry showers dying out overnight then a mainly dry and bright start with lighter winds. Outbreaks of rain and strong winds are likely to spread in from the west but some uncertainty in timings.
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.