Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for settled conditions, moderate confidence in the extent of sunshine through the day and low confidence in rainfall detail into the weekend.
This evening forecast
A band of showers crossing the Park through the early hours, clearing by the morning.
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.
Mountain weather forecast
A bright and sunny day, remaining dry with gentle northerly winds.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
60% | 60% | 00% | 00% | 00% | 00% | 00% | 00% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
NW
14
|
NW
14
|
NE
14
|
NE
15
|
N
15
|
N
14
|
N
10
|
N
9
|
| 600m |
NW
6
|
NW
9
|
NE
11
|
NE
13
|
N
14
|
N
13
|
N
9
|
NE
5
|
| 300m |
NW
3
|
NW
5
|
S
5
|
NE
9
|
N
10
|
N
10
|
N
6
|
SW
3
|
| Valley |
W
3
|
NW
5
|
SE
6
|
NE
9
|
N
10
|
N
10
|
NW
6
|
S
3
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m | 17 | 17 | 17 | 20 | 21 | 20 | 14 | 11 |
| 600m | 9 | 11 | 14 | 18 | 20 | 19 | 14 | 7 |
| 300m | 6 | 8 | 10 | 15 | 17 | 16 | 11 | 5 |
| Valley | 7 | 9 | 12 | 14 | 16 | 16 | 10 | 5 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
1°
|
1°
|
0°
|
1°
|
2°
|
1°
|
1°
|
0°
|
| 600m |
3°
|
3°
|
3°
|
3°
|
4°
|
4°
|
4°
|
2°
|
| 300m |
5°
|
5°
|
5°
|
6°
|
7°
|
7°
|
6°
|
3°
|
| Valley |
7°
|
7°
|
6°
|
7°
|
8°
|
8°
|
7°
|
5°
|
| Freezing Level |
1,100m
|
1,100m
|
1,000m
|
800m
|
700m
|
600m
|
700m
|
700m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
-4°
|
-4°
|
-5°
|
-5°
|
-4°
|
-4°
|
-4°
|
-4°
|
| 600m |
0°
|
0°
|
-1°
|
-1°
|
0°
|
0°
|
0°
|
0°
|
| 300m |
4°
|
3°
|
3°
|
3°
|
4°
|
4°
|
4°
|
2°
|
| Valley |
6°
|
5°
|
4°
|
5°
|
5°
|
5°
|
5°
|
4°
|
Additional weather information
Meteorologist's view
A good day for hill walking, although appropriate layers should be worn due to a risk of wind chill, despite it feeling rather cold on the hills, where skies stay clear of cloud there is a risk of strong sunlight which may require sun cream.
Weather
Any rain and low cloud clearing quickly in the morning to leave behind a good deal of sunshine through the rest of the day with little to no cloud around. Risk of strong sunshine on hill tops.
Chance of cloud-free hill tops
40% becoming 100% by midmorning.
Low cloud and visibility
Moderate to poor visibility in hill fog or rain in the morning, with cloud covering hills over 600m. Visibility quickly becoming excellent and cloud lifting and breaking to leave largely clear skies.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another cold, dry and bright start to the day with increasing fair weather cloud building throughout the morning. Staying largely dry through the day, although perhaps the odd isolated shower in the northeast of the Park by the afternoon.
Chance of cloud-free hill tops
80%
Maximum wind speed expected
Westerly 10mph gusting 20mph becoming northerly 5-10pmh.
Temperature
- At 800m Minus 2 Celsius becoming Plus 1 Celsius.
- Valley Plus 4 Celsius becoming Plus 9 Celsius.
- Freezing level Just above summits.
Low cloud and visibility
Excellent visibility through much of the day with perhaps scattered cloud bases around 800m in the morning, lifting and breaking by the afternoon. Visibilities very briefly becoming moderate in any isolated showers.
Mountain weather information
Fri 26 Apr
Sunrise:
Sunset:
Often cloudy, with heavy rain slowly clearing north. Cloud often covering hill tops. Gentle easterly winds. Freezing level above summits.
Sat 27 Apr
Sunrise:
Sunset:
Heavy rain in the early hours clearing to see brighter spells through the morning. Some showers in the afternoon. Moderate easterly winds. Freezing level above summits.
Sun 28 Apr
Sunrise:
Sunset:
Outbreaks of heavy showers with a risk of thunder. Gentle northerly 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.