Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High overall.
This evening forecast
Mostly dry to end the day with a fair amount of cloud. This may be thick enough to produce some very light spots of rain. Light winds.
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
Cloudy to start but sunny spells by the afternoon. Light winds.
| 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) |
30% | 20% | <05% | <05% | <05% | <05% | <05% | <05% |
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 |
W
7
|
N
9
|
N
13
|
N
14
|
N
13
|
N
14
|
N
17
|
N
22
|
| 600m |
NE
5
|
N
4
|
N
5
|
N
11
|
N
12
|
N
13
|
N
13
|
N
10
|
| 300m |
S
2
|
NW
2
|
NW
3
|
N
8
|
N
9
|
N
10
|
N
9
|
N
5
|
| Valley |
S
2
|
NW
2
|
NW
3
|
N
8
|
N
9
|
N
10
|
N
9
|
N
4
|
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 | 8 | 10 | 16 | 18 | 17 | 19 | 22 | 28 |
| 600m | 6 | 5 | 7 | 15 | 16 | 18 | 18 | 16 |
| 300m | 3 | 4 | 5 | 12 | 14 | 16 | 16 | 14 |
| Valley | 3 | 4 | 5 | 12 | 14 | 15 | 14 | 12 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
7°
|
7°
|
6°
|
6°
|
7°
|
6°
|
6°
|
5°
|
| 600m |
9°
|
8°
|
8°
|
8°
|
9°
|
9°
|
8°
|
7°
|
| 300m |
10°
|
8°
|
8°
|
11°
|
12°
|
12°
|
11°
|
9°
|
| Valley |
10°
|
9°
|
9°
|
11°
|
12°
|
13°
|
12°
|
10°
|
| Freezing Level |
2,100m
|
2,000m
|
1,900m
|
1,800m
|
1,700m
|
1,600m
|
1,600m
|
1,600m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
5°
|
5°
|
3°
|
2°
|
3°
|
3°
|
1°
|
0°
|
| 600m |
7°
|
7°
|
6°
|
6°
|
6°
|
6°
|
5°
|
4°
|
| 300m |
9°
|
8°
|
8°
|
9°
|
10°
|
10°
|
9°
|
8°
|
| Valley |
10°
|
8°
|
9°
|
10°
|
11°
|
11°
|
10°
|
9°
|
Additional weather information
Meteorologist's view
A great day for any outdoor activities. Feeling rather chilly at first with warmer layers recommended. Sunny intervals and moderate to high UV levels expected so sun protection is suggested.
Weather
Some localised mist and fog patches possible, as well as some low cloud, at first, this will quickly clear to leave a bright and dry with plenty of sunny spells by the afternoon. There is a very low risk of some isolated showers later in the day, most likely to the east of the national park.
Chance of cloud-free hill tops
40% rising to 90%
Low cloud and visibility
Any valley mist and fog may lift briefly into low cloud before dissipating. Good to very good visibilities expected with distant hills often turning hazy. Very poor or poor visibility in mist of fog initially or in low cloud as it lifts.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy start with some light showers possible. Turning brighter in the afternoon with sunny spells. Light winds though a little breezier across summits later. Cooler than of late but warm in the sunshine.
Chance of cloud-free hill tops
20% rising to 80% from mid-afternoon.
Maximum wind speed expected
20-25 mph
Temperature
- At 800m Plus 7 Celsius rising to plus 13 Celsius.
- Valley Plus 3 Celsius rising to plus 15 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Low cloud around 300-500ft will lift to above summits from mid-afternoon. Visibility will be poor to very poor amongst low cloud and hill fog but will improve later, becoming good to very good with hazy spells of sunshine across the park.
Mountain weather information
Wed 29 Apr
Sunrise:
Sunset:
A dry and bright day with lots of sunshine. Windy with easterly winds becoming strong over and to the lee of summits and ridges. Freezing level above summits. Feeling warm but chilly in brisk winds.
Thu 30 Apr
Sunrise:
Sunset:
Another settled day. More dry weather and sunny spells throughout. Moderate to fresh easterly winds, often strong over summits and ridges. Warm but a slight wind chill in brisk winds across summits.
Fri 1 May
Sunrise:
Sunset:
Cloudier on Friday with a risk of showers. Light to moderate easterly winds. Warm in any brighter spells.
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.