Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for warm, dry and settled conditions, moderate for extend of low cloud and fog overnight.
This evening forecast
Staying dry this evening with some high cloud perhaps obscuring the sky at times.
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.
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
Plenty of hazy sunshine, staying dry with light winds.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
<05% | <05% | <05% | <05% | <05% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
SW
12
|
SW
11
|
SW
11
|
SW
9
|
SW
9
|
W
8
|
W
5
|
S
5
|
| 600m |
S
11
|
S
10
|
S
10
|
SW
8
|
SW
8
|
W
6
|
W
4
|
SE
4
|
| 300m |
S
6
|
S
5
|
S
6
|
SW
5
|
W
6
|
W
5
|
W
3
|
SE
2
|
| Valley |
S
6
|
S
5
|
S
6
|
W
5
|
NW
6
|
NW
5
|
NW
3
|
SE
2
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m | 16 | 14 | 14 | 13 | 14 | 12 | 8 | 7 |
| 600m | 15 | 14 | 13 | 12 | 12 | 10 | 6 | 5 |
| 300m | 12 | 11 | 11 | 9 | 10 | 9 | 5 | 4 |
| Valley | 12 | 11 | 11 | 9 | 10 | 9 | 6 | 4 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
7°
|
7°
|
6°
|
8°
|
10°
|
11°
|
10°
|
10°
|
| 600m |
8°
|
8°
|
8°
|
9°
|
12°
|
13°
|
12°
|
11°
|
| 300m |
10°
|
9°
|
10°
|
12°
|
14°
|
15°
|
14°
|
13°
|
| Valley |
11°
|
10°
|
10°
|
13°
|
15°
|
16°
|
15°
|
13°
|
| Freezing Level |
2,200m
|
2,100m
|
2,100m
|
2,500m
|
2,500m
|
2,500m
|
2,300m
|
2,200m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
4°
|
4°
|
3°
|
5°
|
8°
|
9°
|
9°
|
9°
|
| 600m |
6°
|
6°
|
5°
|
7°
|
10°
|
12°
|
12°
|
11°
|
| 300m |
8°
|
8°
|
8°
|
11°
|
13°
|
14°
|
14°
|
13°
|
| Valley |
10°
|
9°
|
9°
|
13°
|
14°
|
15°
|
15°
|
13°
|
Additional weather information
Meteorologist's view
Feeling warm in the sunshine with light winds. Strong sunshine expected, wearing sun cream is advised.
Weather
Some low cloud covering northwestern slopes around dawn before quickly lifting and thinning during the morning, elsewhere largely clear skies aside for some high cloud giving some hazy sunshine through the day. Feeling warm with light winds.
Chance of cloud-free hill tops
70% in the northwest becoming 95% by the afternoon for all.
Low cloud and visibility
Occasional low cloud in the northwest around dawn with bases around 500m, the highest summits likely to be above the cloud tops. Once this lifts and clears away, little to no cloud below summits is expected. Visibility poor to moderate at first becoming very good by the afternoon.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another fine and dry day with plenty of hazy sunshine. Feeling warm with lights winds.
Chance of cloud-free hill tops
Greater than 95%.
Maximum wind speed expected
Southwesterly 5-10mph gusts 15mph at height.
Temperature
- At 800m Plus 9 Celsius becoming Plus 13 Celsius.
- Valley Plus 13 Celsius becoming Plus 19 Celsius.
- Freezing level Well above summits.
Low cloud and visibility
Some high level cloud giving to hazy sunshine but bases well above summits. Isolated patches of mist and fog in the valleys in the east of the park, visibility generally very good across the Park by the afternoon.
Mountain weather information
Sat 11 May
Sunrise:
Sunset:
Fine and settled weather continuing with gentle south or southeasterly winds. Freezing level well above summits.
Sun 12 May
Sunrise:
Sunset:
A fine start to the day with increasing cloud through the morning ahead of some thundery outbreaks of rain by the late afternoon. Moderate south or southeasterly winds. Freezing level well above summits.
Mon 13 May
Sunrise:
Sunset:
Feeling cooler than of late as further outbreaks of heavy and possibly thundery rain affect much of the park. Moderate south or southeasterly winds. Freezing level well 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.