Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for the largely fine day Monday, with only a small chance for any showers. Confidence is lower for hill tops remaining clear into the evening, with some low cloud possible. Confidence is then high for a cloudier start Tuesday, but only moderate for the height of the cloud obscuring the summits, and also for the extent of any light rain or drizzle. High confidence for the fine conditions continuing Wednesday and Thursday, but also turning windier. Low confidence for the extent of any showers Friday.
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
Warm sunny spells, but cloud increasing later.
| 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% | 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 |
N
13
|
N
14
|
N
14
|
N
15
|
N
18
|
N
21
|
| 600m |
N
4
|
N
11
|
N
13
|
N
13
|
N
13
|
N
10
|
| 300m |
NW
2
|
N
8
|
N
10
|
N
10
|
N
9
|
N
6
|
| Valley |
NW
2
|
N
8
|
N
10
|
N
10
|
N
8
|
NW
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 16 | 18 | 18 | 19 | 23 | 26 |
| 600m | 6 | 14 | 17 | 18 | 18 | 14 |
| 300m | 4 | 11 | 14 | 14 | 15 | 12 |
| Valley | 4 | 11 | 14 | 14 | 14 | 10 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
8°
|
6°
|
7°
|
7°
|
6°
|
5°
|
| 600m |
9°
|
9°
|
9°
|
9°
|
8°
|
7°
|
| 300m |
9°
|
11°
|
12°
|
12°
|
11°
|
9°
|
| Valley |
9°
|
12°
|
13°
|
13°
|
12°
|
10°
|
| Freezing Level |
1,900m
|
1,900m
|
1,800m
|
1,700m
|
1,600m
|
1,700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
5°
|
3°
|
3°
|
3°
|
1°
|
0°
|
| 600m |
8°
|
6°
|
6°
|
6°
|
5°
|
4°
|
| 300m |
9°
|
10°
|
10°
|
10°
|
9°
|
8°
|
| Valley |
9°
|
11°
|
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 with appropriate sun protection required.
Weather
A fine start, with any early cloud soon breaking and lifting to warm sunshine. Cloud thickening again from the north and east through the afternoon, but staying largely above summits. Perhaps the odd shower moving into eastern parts of the park during the evening.
Chance of cloud-free hill tops
60% at first but soon rising to 90%. Falling to 60% from late afternoon.
Low cloud and visibility
Some cloud could obscure the odd hill above 400m during the morning, but soon breaking and lifting with all hills clear by midday. The odd patch returning above 500m from late afternoon. Outside of cloud, visibility will be very good with distant hills visible, but could fall to moderate with any showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy start with many hills obscured, and some light drizzle possible. Turning brighter in the afternoon with some sunny spells developing and cloud lifting from the summits. Cooler than of late, especially in the chilly easterly breeze.
Chance of cloud-free hill tops
10% rising to 60% by midday, and 90% by the evening.
Maximum wind speed expected
Easterly 20-mph gusting 25-30mph
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
Most hills will be obscured above 500m during the morning, with some low cloud perhaps down to 300m with any light drizzle. This cloud will gradually lift and break during the afternoon, however the odd patch could persist above 800m until after dark. Moderate to good visibility is likely outside of cloud, poor at times in any early morning drizzle, but improving to be good to very good by the evening, with distant hills becoming visible.
Mountain weather information
Wed 29 Apr
Sunrise:
Sunset:
Any early cloud lifting, then dry and bright with lots of warm sunshine. However, also turning windy with strong easterly winds, leading to a cooler feel at times. Freezing level above summits.
Thu 30 Apr
Sunrise:
Sunset:
A very similar day to Wednesday. Dry, and likely sunny, with the strong east to southeast winds continuing. Warm again, but feeling cooler when exposed to the wind.
Fri 1 May
Sunrise:
Sunset:
Low confidence, but likely cloudier on Friday with a risk of showers. However winds also likely easing compared to previous days. Still feeling 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.