Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High overall but low on regional detail for showers.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Mountain weather forecast
Cloudy to start but turning brighter.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
<05% | 30% | 30% | 20% | 20% | 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 |
E
11
|
NE
11
|
N
8
|
N
11
|
N
12
|
NE
15
|
| 600m |
E
5
|
NE
8
|
N
9
|
N
10
|
N
10
|
N
5
|
| 300m |
NE
2
|
N
6
|
N
9
|
N
10
|
N
9
|
N
3
|
| Valley |
NE
2
|
N
5
|
N
9
|
N
10
|
N
8
|
NW
3
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 13 | 14 | 12 | 14 | 17 | 21 |
| 600m | 7 | 11 | 12 | 14 | 15 | 10 |
| 300m | 3 | 9 | 12 | 14 | 14 | 10 |
| Valley | 3 | 9 | 12 | 15 | 13 | 9 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
5°
|
5°
|
6°
|
6°
|
4°
|
4°
|
| 600m |
7°
|
8°
|
8°
|
8°
|
7°
|
6°
|
| 300m |
8°
|
10°
|
11°
|
10°
|
10°
|
8°
|
| Valley |
9°
|
12°
|
12°
|
12°
|
11°
|
9°
|
| Freezing Level |
1,700m
|
1,700m
|
1,700m
|
1,700m
|
1,700m
|
1,500m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
2°
|
2°
|
3°
|
2°
|
0°
|
0°
|
| 600m |
5°
|
6°
|
6°
|
6°
|
4°
|
4°
|
| 300m |
8°
|
9°
|
9°
|
8°
|
8°
|
8°
|
| Valley |
9°
|
10°
|
10°
|
9°
|
9°
|
9°
|
Additional weather information
Meteorologist's view
Wet ground likely present which will make steeper slopes slippery underfoot.
Weather
Any overnight low cloud and drizzle should lift and break during the morning, to leave a drier and brighter afternoon for much of the park. A small risk of a few passing light showers.
Chance of cloud-free hill tops
40% during the early hours, rising to 80% during the morning and 90% for the afternoon.
Low cloud and visibility
Cloud bases of 400m during the early hours, occasionally down to 300m. Lifting to 600m through the morning, but then should be above the summits in the afternoon. Poor to very poor visibility in the hill fog, but conditions improving into the afternoon with good visibility likely.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Bright or sunny spells and scattered light showers.
Chance of cloud-free hill tops
90%
Maximum wind speed expected
Northerly 20-25 mph.
Temperature
- At 800m Plus 3-7 Celsius.
- Valley Plus 4 Celsius, rising to plus 13 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Patchy summit cloud at first, lifting to leave cloud generally above summits, with generally good to very good visibility.
Mountain weather information
Wed 6 May
Sunrise:
Sunset:
Variable cloud with bright or sunny spells and scattered showers. Moderate east or northeast winds. Freezing levels will be just above summits.
Thu 7 May
Sunrise:
Sunset:
Variable cloud with bright or sunny spells and scattered showers. Moderate southerly winds. Freezing levels will be above summits.
Fri 8 May
Sunrise:
Sunset:
Variable cloud with bright or sunny spells and scattered showers. Moderate southerly winds. Freezing levels will be 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.