Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for high pressure bringing settled conditions during the day on Saturday. Lower confidence from Sunday onwards as more unsettled conditions arrive from the west. Also low confidence for the window of settled weather mid-week.
This evening forecast
Outbreaks of rain, with snow above 600 or 700m, during the evening. Strong northerly winds on the tops with a severe chill effect. Freezing level lowering to 800m.
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.
Mountain weather forecast
Early wintry showers then dry with sunny spells. Sleet, snow and strong winds later. Cold.
| 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) |
70% | 70% | 60% | 20% | 10% | 10% | 30% | 80% |
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 |
N
24
|
N
19
|
NW
14
|
W
15
|
W
15
|
SW
19
|
S
27
|
S
33
|
| 600m |
N
15
|
N
11
|
NW
8
|
W
9
|
W
12
|
SW
16
|
S
18
|
S
22
|
| 300m |
N
10
|
NW
7
|
NW
5
|
W
6
|
W
9
|
SW
12
|
S
12
|
S
16
|
| Valley |
N
9
|
NW
7
|
NW
6
|
W
7
|
W
10
|
SW
11
|
S
12
|
S
16
|
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 | 30 | 24 | 17 | 19 | 22 | 27 | 35 | 43 |
| 600m | 21 | 16 | 12 | 13 | 18 | 23 | 25 | 32 |
| 300m | 19 | 15 | 10 | 12 | 16 | 21 | 23 | 29 |
| Valley | 18 | 14 | 11 | 12 | 16 | 19 | 22 | 29 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
0°
|
-1°
|
-1°
|
-2°
|
-1°
|
0°
|
-1°
|
0°
|
| 600m |
2°
|
1°
|
1°
|
1°
|
2°
|
2°
|
2°
|
2°
|
| 300m |
4°
|
4°
|
3°
|
3°
|
5°
|
5°
|
4°
|
4°
|
| Valley |
6°
|
5°
|
4°
|
5°
|
6°
|
7°
|
6°
|
6°
|
| Freezing Level |
800m
|
700m
|
700m
|
500m
|
500m
|
600m
|
700m
|
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 |
-8°
|
-8°
|
-7°
|
-7°
|
-6°
|
-7°
|
-8°
|
-8°
|
| 600m |
-3°
|
-3°
|
-3°
|
-3°
|
-3°
|
-3°
|
-4°
|
-4°
|
| 300m |
1°
|
1°
|
0°
|
1°
|
1°
|
1°
|
0°
|
0°
|
| Valley |
2°
|
2°
|
2°
|
2°
|
3°
|
3°
|
2°
|
2°
|
Additional weather information
Meteorologist's view
A ridge of high pressure moving east will give a window of settled weather on Saturday with some good sunshine for several hours. Note the deteriorating conditions from early evening with winds strengthening and sleet and snow arriving.
Weather
Cloudy overnight and to start the morning with a few showers, these wintry above 400m. Becoming dry during the morning with good spells of sunshine developing for much of the day. Cloud and outbreaks of rain will spread east from early evening, falling as snow for a time 500m.
Chance of cloud-free hill tops
30% at first becoming 90% during the morning, then becoming 30% during evening.
Low cloud and visibility
Occasional cloud and fog above 600m overnight, clearing during the morning. Visibility outside of cloud mainly good but some reductions to a few km or less in the wintry showers at first. Cloud becoming extensive above 500m during the evening with poor visibility in snow.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Much more unsettled with spells of rain or drizzle, heavy at times and combined with gale force winds. Some brief sleet or snow on the tops in the early hours before much milder conditions arrive by morning.
Chance of cloud-free hill tops
Less than 10%.
Maximum wind speed expected
South or Southwest 30 to 40mph gusts 60mph.
Temperature
- At 800m Plus 2C rising to 7C.
- Valley Plus 6C rising to 10 or 11C.
- Freezing level 800m at midnight, quickly rising above summits.
Low cloud and visibility
Extensive poor visibility with cloud and fog down to 300 or 500m, lower at times on western upslopes.
Mountain weather information
Mon 2 Mar
Sunrise:
Sunset:
Outbreaks of rain are likely to continue but strong to gale force southerly winds easing. Freezing level above summits, perhaps falling to 600m later.
Tue 3 Mar
Sunrise:
Sunset:
Low confidence at this stage but there is a signal for more settled and brighter conditions with light winds. Freezing level 400 to 600m.
Wed 4 Mar
Sunrise:
Sunset:
Dry conditions are likely but rain or snow may spread in from the Atlantic later with strengthening 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.