Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Confidence is high for the settled weather giving way to more unsettled conditions after the weekend. Lower for the details of this transition, also for cloud amounts and heights.
This evening forecast
Fine and dry this evening, with hazy sunshine likely. Any cloud above the hilltops, with generally good visibility. Perhaps some fog patches forming in the valleys later in the evening, bringing very poor visibility. Light winds, with temperatures soon dropping.
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 sunny spells. Early valley fog soon clearing.
| 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 |
S
6
|
NW
4
|
NE
4
|
NE
3
|
SW
3
|
NW
5
|
W
4
|
SE
7
|
| 600m |
S
5
|
S
4
|
E
3
|
NE
2
|
NW
3
|
NW
6
|
NW
3
|
SE
5
|
| 300m |
SE
2
|
S
3
|
SE
2
|
SE
1
|
W
3
|
NW
5
|
W
2
|
SE
3
|
| Valley |
SE
3
|
S
3
|
S
2
|
S
1
|
NW
4
|
NW
5
|
W
2
|
S
3
|
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 | 7 | 5 | 6 | 4 | 5 | 8 | 6 | 9 |
| 600m | 6 | 5 | 5 | 4 | 6 | 9 | 4 | 6 |
| 300m | 4 | 4 | 3 | 3 | 6 | 8 | 3 | 4 |
| Valley | 4 | 4 | 3 | 3 | 6 | 8 | 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 |
6°
|
5°
|
5°
|
6°
|
7°
|
8°
|
6°
|
5°
|
| 600m |
8°
|
7°
|
6°
|
8°
|
10°
|
10°
|
8°
|
7°
|
| 300m |
9°
|
8°
|
7°
|
9°
|
12°
|
12°
|
10°
|
8°
|
| Valley |
9°
|
8°
|
8°
|
9°
|
13°
|
13°
|
10°
|
9°
|
| Freezing Level |
1,300m
|
1,200m
|
1,200m
|
1,200m
|
1,300m
|
1,500m
|
1,500m
|
1,500m
|
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°
|
3°
|
5°
|
7°
|
6°
|
5°
|
3°
|
| 600m |
6°
|
5°
|
5°
|
7°
|
9°
|
9°
|
7°
|
6°
|
| 300m |
9°
|
7°
|
6°
|
8°
|
11°
|
11°
|
9°
|
8°
|
| Valley |
9°
|
7°
|
7°
|
9°
|
12°
|
12°
|
10°
|
8°
|
Additional weather information
Meteorologist's view
Moderate UV levels are possible at height, therefore sun protection may be needed.
Weather
Dry with clear spells overnight, allowing a touch of frost in some sheltered spots and some valley fog patches. Any valley fog and frost soon clearing during the morning, leaving a dry day with sunny spells.
Chance of cloud-free hill tops
80% becoming 100% by mid-morning.
Low cloud and visibility
Cloud mostly well above the hilltops, with generally good visibility, although this perhaps rather hazy with distant hills obscured or unclear. Overnight valley fog may temporarily give very poor visibility as it lifts and breaks during the morning.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another dry night with clear spells giving a risk of ground frost and valley fog patches. However, this soon clearing as cloud thickens during the morning, with outbreaks of mostly light rain possible from late morning.
Chance of cloud-free hill tops
90% becoming 60% from late morning.
Maximum wind speed expected
West or northwest 15-25 mph.
Temperature
- At 800m Plus 6C.
- Valley Zero C becoming plus 15C.
- Freezing level Just above summits.
Low cloud and visibility
Cloud mostly well above the hilltops, with good visibility. Overnight valley fog may temporarily give very poor visibility as it lifts and breaks during the morning. Areas of cloud with base 400-600m developing from late morning, with visibility occasionally poor or very poor in rain and low cloud.
Mountain weather information
Mon 23 Mar
Sunrise:
Sunset:
Dry with bright or sunny spells and cloud mostly above hilltops. Moderate northeasterly winds becoming strong southwesterly. Freezing level above summits.
Tue 24 Mar
Sunrise:
Sunset:
Rain arriving, perhaps heavy at times, with strong to gale force southwesterly winds. Freezing level lowering near to 800m later.
Wed 25 Mar
Sunrise:
Sunset:
Rain clearing overnight. Sunny spells and showers, which could be heavy and thundery at times, turning wintry above around 400-500m. Gale force westerly or northwesterly winds, perhaps storm force on highest summits. Freezing level falling to around 500m.
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.