Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for dry and fine through Friday and Saturday and a change to more unsettled conditions thereafter, but lower for amount of cloud above the summits next couple of days and timing of arrival of rain later Sunday.
This evening forecast
Dry with clear spells, any cloud expected to be above the summits. Light winds.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Dry with long sunny spells. 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) |
00% | 00% | 00% | 00% | 00% | 00% | 00% | 00% |
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
7
|
SE
7
|
SE
5
|
S
4
|
SW
3
|
W
4
|
W
5
|
E
6
|
| 600m |
SE
6
|
SE
6
|
SE
5
|
SE
4
|
SW
3
|
W
5
|
NW
3
|
E
4
|
| 300m |
SE
5
|
SE
4
|
SE
3
|
SE
2
|
W
2
|
NW
4
|
NW
2
|
E
3
|
| Valley |
SE
6
|
S
5
|
S
4
|
S
3
|
NW
3
|
N
5
|
NW
2
|
SE
2
|
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 | 9 | 8 | 6 | 6 | 6 | 7 | 7 | 8 |
| 600m | 8 | 8 | 7 | 6 | 6 | 8 | 4 | 6 |
| 300m | 7 | 7 | 6 | 5 | 6 | 8 | 4 | 5 |
| Valley | 9 | 8 | 7 | 5 | 6 | 9 | 3 | 4 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
5°
|
4°
|
3°
|
6°
|
8°
|
8°
|
6°
|
4°
|
| 600m |
7°
|
6°
|
5°
|
8°
|
10°
|
11°
|
8°
|
6°
|
| 300m |
8°
|
7°
|
7°
|
10°
|
12°
|
13°
|
10°
|
7°
|
| Valley |
9°
|
8°
|
7°
|
11°
|
13°
|
13°
|
10°
|
8°
|
| Freezing Level |
1,300m
|
1,200m
|
1,200m
|
1,200m
|
1,300m
|
1,500m
|
1,400m
|
1,300m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
3°
|
2°
|
1°
|
4°
|
7°
|
8°
|
5°
|
2°
|
| 600m |
5°
|
4°
|
3°
|
7°
|
10°
|
10°
|
8°
|
5°
|
| 300m |
7°
|
6°
|
5°
|
10°
|
12°
|
12°
|
10°
|
6°
|
| Valley |
7°
|
7°
|
6°
|
11°
|
13°
|
13°
|
10°
|
8°
|
Additional weather information
Meteorologist's view
Low level temperatures rising to around 15 or 16 Celsius by day.
Weather
Dry with long clear or sunny spells, the sunshine may be rather hazy at times. Risk of a few low level mist and fog patches around dawn.
Chance of cloud-free hill tops
Close to 100%
Low cloud and visibility
Little or no cloud expected below summit level. Visibility perhaps locally less than a kilometre in any early low level mist and fog, otherwise very good or excellent with good panoramic views of surrounding mountains.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another fine, dry day with long clear or sunny spells, once again risk of a few early low level mist or fog patches and the sunshine may be rather hazy at times.
Chance of cloud-free hill tops
Close to 100%
Maximum wind speed expected
Variable less than 10mph.
Temperature
- At 800m Around plus 3 Celsius, rising to plus 10 Celsius by day
- Valley Around plus 1 or 2 Celsius at dawn rising to plus 16 Celsius by day
- Freezing level Above the summits
Low cloud and visibility
Little or no cloud expected below summit level. Visibility perhaps locally less than a kilometre in any early low level mist and fog, otherwise very good or excellent with good panoramic views of surrounding mountains.
Mountain weather information
Sun 22 Mar
Sunrise:
Sunset:
Dry bright start but cloud increasing through the day with outbreaks of mainly light rain in evening. Freshening southwesterly breeze. Freezing level above summits.
Mon 23 Mar
Sunrise:
Sunset:
Cloud and overnight rain clearing then sunny spells and a few wintry showers. Occasionally strong northwesterly winds easing. Freezing level falling to 600m.
Tue 24 Mar
Sunrise:
Sunset:
Cloudy with outbreaks of rain, persistent and heavy at times. Strong southwesterly winds, risk of summit gales. Freezing level rising above summits.
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.