Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for overall conditions, low for location of mist and fog patches through tomorrow morning and for location of showers next week.
This evening forecast
A dry and fine end to the day with plenty of sunshine and gentle 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.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
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 bright and sunny day ahead.
| 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) |
<05% | <05% | <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 |
SE
8
|
SE
5
|
SE
4
|
NE
3
|
W
4
|
NW
6
|
NE
5
|
E
9
|
| 600m |
SE
7
|
SE
5
|
SE
5
|
E
2
|
NW
4
|
NW
6
|
N
4
|
E
7
|
| 300m |
SE
5
|
SE
4
|
SE
4
|
SE
1
|
NW
4
|
NW
6
|
NW
3
|
E
4
|
| Valley |
SE
5
|
SE
4
|
SE
4
|
SE
1
|
NW
5
|
NW
6
|
NW
3
|
SE
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 | 10 | 6 | 5 | 5 | 8 | 10 | 7 | 11 |
| 600m | 10 | 6 | 7 | 4 | 8 | 10 | 6 | 10 |
| 300m | 7 | 5 | 5 | 3 | 8 | 9 | 5 | 8 |
| Valley | 8 | 6 | 6 | 3 | 8 | 9 | 5 | 8 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
8°
|
7°
|
7°
|
9°
|
11°
|
11°
|
10°
|
8°
|
| 600m |
10°
|
9°
|
9°
|
11°
|
13°
|
13°
|
12°
|
10°
|
| 300m |
11°
|
10°
|
11°
|
14°
|
16°
|
16°
|
14°
|
12°
|
| Valley |
12°
|
11°
|
11°
|
15°
|
16°
|
16°
|
14°
|
12°
|
| Freezing Level |
1,400m
|
1,300m
|
1,300m
|
1,300m
|
1,800m
|
2,100m
|
2,100m
|
2,100m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
6°
|
6°
|
6°
|
8°
|
10°
|
10°
|
9°
|
6°
|
| 600m |
8°
|
8°
|
8°
|
11°
|
12°
|
12°
|
12°
|
9°
|
| 300m |
10°
|
10°
|
10°
|
14°
|
15°
|
14°
|
14°
|
11°
|
| Valley |
10°
|
10°
|
11°
|
15°
|
16°
|
15°
|
14°
|
11°
|
Additional weather information
Meteorologist's view
A great day for any outdoor activities. Feeling rather chilly at first with warmer layers recommended. Strong sunshine and high UV levels expected so sun protection is suggested.
Weather
Some isolated mist or fog patches in sheltered valleys to start, this will quickly clear soon after dawn. A dry and bright day to follow with sunshine turning hazy at times. Feeling warm in the sunshine due to light to moderate southeasterly winds.
Chance of cloud-free hill tops
95%
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.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A somewhat cloudier day with hazy sunshine likely throughout and patchy lower level cloud around at times. Clouds largely all above summits. Through the evening low cloud and sea fog may move in from the west effecting mainly westward facing slopes. Gentle to moderate south-easterly winds. Freezing level above summits.
Chance of cloud-free hill tops
95% dropping to 40% through the evening.
Maximum wind speed expected
Southerly 15-25 mph.
Temperature
- At 800m Plus 6 rising to Plus 10.
- Valley Plus 11 rising to Plus 16.
- Freezing level Above summits.
Low cloud and visibility
Very good visibility with clear summits, some distant summits may be hazy. Through the evening low cloud and sea fog extending from the surface to above summits may bring very poor or poor visibilities.
Mountain weather information
Mon 27 Apr
Sunrise:
Sunset:
Another mostly dry and bright day, once any lingering low cloud and fog clears away after dawn, with some patchy lower cloud around at times, the potential for some isolated showers at times through the afternoon. Gentle to moderate south-easterly winds. Freezing level above summits.
Tue 28 Apr
Sunrise:
Sunset:
Return to dry conditions on Tuesday although variable amounts of cloud around throughout the day. Gentle to moderate easterly winds and freezing level above summits.
Wed 29 Apr
Sunrise:
Sunset:
Another dry and bright day with patchy cloud and gentle to moderate winds. 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.