Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
There is high confidence in settled conditions, though uncertainty remains regarding the extent of cloud cover, the likelihood of isolated showers on Friday, and the number of cloud breaks.
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
A largely cloudy day with isolated showers in the north and east of the park.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
20% | 20% | 10% | 10% | 10% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
W
10
|
W
11
|
W
13
|
W
13
|
NW
11
|
W
10
|
| 600m |
SW
8
|
SW
9
|
W
11
|
W
11
|
NW
8
|
SW
6
|
| 300m |
S
3
|
SW
5
|
W
8
|
W
8
|
NW
5
|
SW
2
|
| Valley |
S
3
|
SW
5
|
W
8
|
NW
8
|
NW
5
|
SW
2
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 11 | 14 | 17 | 17 | 14 | 12 |
| 600m | 10 | 12 | 15 | 15 | 11 | 8 |
| 300m | 6 | 8 | 13 | 13 | 8 | 5 |
| Valley | 6 | 9 | 13 | 13 | 8 | 5 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
8°
|
9°
|
10°
|
10°
|
10°
|
10°
|
| 600m |
11°
|
11°
|
13°
|
13°
|
13°
|
12°
|
| 300m |
13°
|
14°
|
15°
|
16°
|
15°
|
14°
|
| Valley |
14°
|
15°
|
17°
|
17°
|
17°
|
15°
|
| Freezing Level |
3,100m
|
3,200m
|
3,200m
|
3,100m
|
3,000m
|
3,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
6°
|
6°
|
7°
|
8°
|
8°
|
8°
|
| 600m |
9°
|
9°
|
11°
|
11°
|
12°
|
11°
|
| 300m |
12°
|
13°
|
14°
|
15°
|
15°
|
14°
|
| Valley |
14°
|
14°
|
15°
|
16°
|
16°
|
15°
|
Additional weather information
Meteorologist's view
Feeling cooler than it has done of late, although in any cloudy breaks, UV is still expected to be High given the time of year.
Weather
A potentially cooler start to the day compared to recent mornings, with cloud soon spreading across the park. Isolated drizzly showers may develop in the north and east, while the southwest is likely to see the best chances of drier and brighter spells.
Chance of cloud-free hill tops
40% in the north and east, 70% in the south and west.
Low cloud and visibility
Broken layers of cloud are expected to obscure hills above 500-600m, with patchier cloud on northwestern slopes possibly lowering to around 400m. Further south and west, cloud breaks are likely to be more frequent, with bases generally at or above 800m. Visibility will be very good overall, offering clear views of distant hills, though it may briefly reduce in any drizzly showers across the north and east before quickly improving again.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Often cloudy with some occasional sunny breaks. Isolated showers are possible, perhaps most likely in the west of the park.
Chance of cloud-free hill tops
60%.
Maximum wind speed expected
Southwesterly 5-10mph gusting up to 15mph on exposed slopes becoming light and variable into the evening.
Temperature
- At 800m Plus 09 Celsius becoming Plus 12 Celsius.
- Valley Plus 13 Celsius becoming Plus 19 Celsius.
- Freezing level Well above summits.
Low cloud and visibility
Scattered cloud with some sunny spells, although bases are likely to be around 600-700m, especially in any showers. Visibility generally very good, falling to poor in showers, most likely on western upslopes.
Mountain weather information
Sun 24 Aug
Sunrise:
Sunset:
Sunny spells and isolated showers with light and variable winds.
Mon 25 Aug
Sunrise:
Sunset:
A fine day with plenty of sunshine and light and variable winds. Feeling warm.
Tue 26 Aug
Sunrise:
Sunset:
Cloud increasing from the west, with wind and rain arriving into the afternoon. Moderate southeasterly winds becoming a gale-force southerly.
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.