Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High in general but moderate for cloud details.
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
Another fine day with plenty of sunshine.
| Time | 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% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
SE
19
|
SE
17
|
SE
10
|
SE
11
|
SE
11
|
SE
12
|
| 600m |
SE
11
|
NE
5
|
SE
8
|
SE
8
|
SE
7
|
SE
9
|
| 300m |
SE
6
|
E
3
|
SE
6
|
SE
7
|
SE
5
|
SE
6
|
| Valley |
SE
6
|
E
3
|
SE
6
|
SE
7
|
SE
5
|
SE
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 23 | 20 | 14 | 14 | 15 | 15 |
| 600m | 19 | 6 | 11 | 12 | 10 | 12 |
| 300m | 16 | 5 | 10 | 11 | 10 | 11 |
| Valley | 16 | 5 | 9 | 11 | 10 | 11 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
10°
|
9°
|
10°
|
11°
|
10°
|
8°
|
| 600m |
13°
|
12°
|
13°
|
14°
|
13°
|
10°
|
| 300m |
12°
|
14°
|
16°
|
17°
|
16°
|
12°
|
| Valley |
12°
|
15°
|
18°
|
18°
|
17°
|
13°
|
| Freezing Level |
1,300m
|
1,200m
|
1,300m
|
1,400m
|
1,400m
|
1,400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
7°
|
6°
|
8°
|
9°
|
8°
|
6°
|
| 600m |
10°
|
11°
|
12°
|
12°
|
12°
|
8°
|
| 300m |
11°
|
13°
|
14°
|
15°
|
14°
|
10°
|
| Valley |
11°
|
14°
|
16°
|
16°
|
16°
|
11°
|
Additional weather information
Meteorologist's view
A fine day expected. Strong sunshine and high UV levels expected, even as temperatures remain somewhat cool in the breeze.
Weather
Patchy low cloud possible in the east of the park at first, and the potential for some mist of fog patches in sheltered valleys. These are likely to clear quickly into the morning to leave a day of dry and fine weather, with plenty of sunshine. Sunshine may turn hazy at times through the evening.
Chance of cloud-free hill tops
95%.
Low cloud and visibility
Patchy low cloud possible between 100-300m at first, likely confined to the far east of the park, and a low risk of some fog in sheltered valleys with a significant inversion likely. After dawn these should quickly clear to leave cloud free skies by mid-morning as conditions warm. Visibility will be very poor or poor in any low cloud or fog initially but very good otherwise with views over distant peaks.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another dry and bright day ahead with plenty of sunshine. Skies may turn hazy at times through the afternoon with increasing amounts of cloud. Winds continuing to ease becoming a light to moderate south-easterly.
Chance of cloud-free hill tops
95%.
Maximum wind speed expected
South-easterly 10-20mph.
Temperature
- At 800m Plus 3 Celsius rising to Plus 11 Celsius.
- Valley Plus 9 Celsius rising to Plus 17 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Potential for some mist and fog in sheltered valleys at first which should quickly lift once the sun rises. Visibility will be poor or very poor in any mist or fog at first but excellent otherwise, with good views over distant peaks likely.
Mountain weather information
Sun 26 Apr
Sunrise:
Sunset:
A somewhat cloudier day with hazy sunshine likely throughout and patchy lower level cloud around at times. Clouds largely all above summits. Gentle to moderate south-easterly winds. Freezing level above summits.
Mon 27 Apr
Sunrise:
Sunset:
Another bright day with sunny spells as fair weather cloud develops over high ground, bringing a low risk of showers into the afternoon and evening. Gentle to moderate easterly winds and freezing level above summits.
Tue 28 Apr
Sunrise:
Sunset:
Another similar day ahead with bright conditions to start and some patchy cloud developing through the afternoon. 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.