Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence that high pressure will bring a lot of dry, settled and very mild weather over the next few days. There is some uncertainty in day to day cloud amounts.
This evening forecast
Dry with clear spells at first then becoming cloudy with the odd spot of rain and some patchy fog on the tops. Strong southerly winds. Mild.
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 bright or sunny spells. Light winds. Very mild or warm.
| 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) |
20% | 20% | 20% | 10% | 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
32
|
S
24
|
SE
16
|
SE
13
|
SE
14
|
S
11
|
E
12
|
E
11
|
| 600m |
S
20
|
S
17
|
SE
11
|
E
7
|
E
8
|
SW
7
|
SE
8
|
E
8
|
| 300m |
S
14
|
S
10
|
SE
6
|
SE
4
|
SW
4
|
SW
5
|
SE
3
|
E
6
|
| Valley |
S
14
|
S
9
|
SE
6
|
E
4
|
NE
3
|
N
5
|
SE
3
|
SE
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 | 37 | 28 | 19 | 16 | 18 | 14 | 14 | 14 |
| 600m | 26 | 22 | 14 | 9 | 11 | 10 | 11 | 11 |
| 300m | 25 | 19 | 9 | 9 | 6 | 8 | 8 | 10 |
| Valley | 24 | 18 | 9 | 9 | 6 | 8 | 8 | 10 |
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°
|
8°
|
10°
|
11°
|
10°
|
9°
|
| 600m |
6°
|
6°
|
7°
|
9°
|
12°
|
13°
|
12°
|
11°
|
| 300m |
9°
|
8°
|
9°
|
11°
|
15°
|
15°
|
13°
|
12°
|
| Valley |
10°
|
10°
|
9°
|
12°
|
16°
|
17°
|
14°
|
13°
|
| Freezing Level |
1,900m
|
1,800m
|
1,800m
|
1,800m
|
1,800m
|
1,900m
|
2,100m
|
2,100m
|
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°
|
5°
|
7°
|
9°
|
8°
|
7°
|
| 600m |
2°
|
2°
|
4°
|
7°
|
11°
|
12°
|
11°
|
9°
|
| 300m |
6°
|
6°
|
7°
|
10°
|
14°
|
14°
|
13°
|
11°
|
| Valley |
7°
|
7°
|
8°
|
11°
|
15°
|
16°
|
14°
|
12°
|
Additional weather information
Meteorologist's view
Dry with plenty of sunshine and feeling warm in the valleys in the afternoon with highs of 17 to 20 Celsius.
Weather
Clear spells developing overnight with some patchy fog in the valleys. Any fog soon clearing, otherwise a dry day with plenty of sunshine, this becoming hazy at times in the afternoon. Dry evening with clear spells.
Chance of cloud-free hill tops
30% at midnight becoming 90% by the morning.
Low cloud and visibility
Mainly good visibility. Patchy cloud above 600m, clearing overnight. Some patches of valley fog at first but these soon clearing.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry with clear spells overnight then Thursday will remain dry and sunny. A chilly start then becoming very mild again in the valleys, but feeling cooler on the tops in the easterly breeze.
Chance of cloud-free hill tops
100%.
Maximum wind speed expected
East or Southeast 10 to 15mph.
Temperature
- At 800m Plus 7C rising to 11 or 12C during daytime.
- Valley Plus 9C rising to 16 or 17C.
- Freezing level Above summits.
Low cloud and visibility
Good visibility with no cloud expected.
Mountain weather information
Fri 20 Mar
Sunrise:
Sunset:
High pressure will continue to bring dry weather with plenty of sunshine and light winds. Mild by day and rather chilly overnight. Freezing level above summits.
Sat 21 Mar
Sunrise:
Sunset:
Remaining dry with bright or sunny spells and light winds. Mild by day and rather chilly overnight. Freezing level above summits.
Sun 22 Mar
Sunrise:
Sunset:
Likely to be dry for most of the day. A chance of cloud and rain spreading in from the west later with strengthening winds. Freezing level 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.