Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for overall unsettled weather over the next number of days with sunshine and blustery showers. Lower on the clearance of rain early on and distribution of showers.
This evening forecast
Cloudy this evening with drizzle. More persistent rain arriving into the night.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Rain clearing eastwards followed by sunshine and blustery showers.
| 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) |
90% | 90% | 60% | 60% | 60% | 70% | 70% | 70% |
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 |
S
44
|
SW
27
|
SW
32
|
SW
32
|
SW
39
|
S
43
|
S
48
|
SW
49
|
| 600m |
S
32
|
S
19
|
SW
19
|
SW
24
|
SW
29
|
S
33
|
S
34
|
SW
35
|
| 300m |
S
22
|
S
12
|
SW
12
|
SW
17
|
SW
22
|
S
25
|
S
24
|
S
24
|
| Valley |
S
22
|
S
11
|
SW
11
|
SW
17
|
SW
21
|
S
24
|
S
23
|
S
24
|
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 | 54 | 34 | 40 | 42 | 51 | 57 | 62 | 64 |
| 600m | 42 | 26 | 27 | 33 | 41 | 47 | 48 | 49 |
| 300m | 38 | 21 | 23 | 30 | 38 | 42 | 43 | 43 |
| Valley | 38 | 20 | 22 | 29 | 37 | 41 | 41 | 43 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
2°
|
-1°
|
-2°
|
-2°
|
-1°
|
0°
|
0°
|
0°
|
| 600m |
4°
|
2°
|
1°
|
1°
|
2°
|
3°
|
2°
|
3°
|
| 300m |
6°
|
4°
|
3°
|
4°
|
5°
|
6°
|
5°
|
5°
|
| Valley |
8°
|
6°
|
4°
|
6°
|
7°
|
7°
|
6°
|
7°
|
| Freezing Level |
1,500m
|
700m
|
500m
|
500m
|
600m
|
700m
|
800m
|
1,000m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-7°
|
-9°
|
-11°
|
-10°
|
-10°
|
-9°
|
-10°
|
-9°
|
| 600m |
-3°
|
-4°
|
-6°
|
-6°
|
-5°
|
-5°
|
-5°
|
-5°
|
| 300m |
2°
|
0°
|
-1°
|
-1°
|
0°
|
0°
|
-1°
|
0°
|
| Valley |
3°
|
2°
|
1°
|
1°
|
2°
|
2°
|
1°
|
2°
|
Additional weather information
Meteorologist's view
A cold and blustery day with layers and waterproofs advised with a severe wind chill. Snow also possible, with buffeting expected when walking.
Weather
Any lingering overnight rain or sleet should quickly clear eastwards after dawn with patchy lower cloud moving away with it. Skies will then turn brighter with sunny spells and blustery scattered showers expected for the remainder of the day, especially late afternoon. These showers have the potential to be heavy at times with the risk of hail and falling as snow over the highest summits.
Chance of cloud-free hill tops
40% rising 70% through the morning, lowering in any heavy showers.
Low cloud and visibility
Patchy low cloud around 600-800m through the morning which should gradually clear eastwards. Cloud bases should then generally be above summits but lowering down to 600-900m, in association with heavier showers later. Visibilities moderate to poor or perhaps very poor at first quickly becoming very good to excellent outside of any patchy cloud or showers, through the afternoon, which could drop visibilities temporarily to poor or very poor.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A blustery start with showers merging into longer spells of rain through the early hours. Showers generally less frequent than on Saturday with sunny spells more widespread. Any showers still could be heavy with the odd rumble of thunder. Winds also gradually easing.
Chance of cloud-free hill tops
60% early on, otherwise 80%.
Maximum wind speed expected
Southwesterly 35-40mph, gusting 45-50 mph.
Temperature
- At 800m Plus 2 Celsius rising to plus 4 Celsius.
- Valley Plus 7 Celsius rising to plus 10 Celsius.
- Freezing level Just above summits.
Low cloud and visibility
Patchy low cloud early on down to 500-700 m, otherwise cloud above summits. Very poor initially then rising to good or very good outside showers.
Mountain weather information
Mon 13 Apr
Sunrise:
Sunset:
Another cold start with low cloud first thing. Further sunny spells and scattered showers, these heavy with hail and the odd rumble of thunder. Winds easing but gusty around downpours. Freezing level above summits.
Tue 14 Apr
Sunrise:
Sunset:
Murky with low cloud and patchy outbreaks of rain and drizzle possible later in the day. Freezing level above summits with lighter winds.
Wed 15 Apr
Sunrise:
Sunset:
Cloudy with outbreaks of rain, heavy at times, perhaps brightening up later. Moderate southerly winds.
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.