Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for cold, showery conditions at first then gradually becoming less cold with winds and showers easing as high pressure tries to build from the west, but lower with regard to shower distribution and timing.
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
Sunny spells and snow showers. Bitterly cold, strong northerly winds.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
40% | 10% | 20% | 20% | 20% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
N
23
|
N
23
|
N
24
|
N
28
|
N
27
|
NE
22
|
| 600m |
N
16
|
N
18
|
N
21
|
N
22
|
N
20
|
NE
14
|
| 300m |
N
10
|
N
12
|
N
14
|
N
15
|
N
12
|
NE
8
|
| Valley |
N
11
|
N
12
|
N
15
|
N
16
|
N
13
|
NE
9
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m | 27 | 28 | 32 | 36 | 35 | 28 |
| 600m | 21 | 23 | 28 | 30 | 27 | 20 |
| 300m | 20 | 20 | 25 | 27 | 23 | 17 |
| Valley | 20 | 20 | 26 | 28 | 23 | 18 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
-2°
|
-3°
|
-2°
|
-2°
|
-2°
|
-2°
|
| 600m |
0°
|
0°
|
1°
|
1°
|
1°
|
0°
|
| 300m |
3°
|
3°
|
4°
|
4°
|
4°
|
3°
|
| Valley |
4°
|
4°
|
5°
|
6°
|
5°
|
4°
|
| Freezing Level |
600m
|
400m
|
500m
|
600m
|
600m
|
600m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
-10°
|
-11°
|
-10°
|
-10°
|
-10°
|
-10°
|
| 600m |
-6°
|
-7°
|
-6°
|
-5°
|
-5°
|
-5°
|
| 300m |
-1°
|
-2°
|
-1°
|
-1°
|
-1°
|
-1°
|
| Valley |
0°
|
0°
|
1°
|
1°
|
1°
|
1°
|
Additional weather information
Meteorologist's view
Gusts around 50mph over higher summits and ridges through the middle of the day with a severe chill effect.
Weather
A cloudy start with light rain and snow over hills soon clearing south to leave some dry and brighter conditions with a good deal of sunny spells. Isolated wintry showers, perhaps heavy at times with snow above 600m. The showers die out during the evening to leave a mainly dry night with long clear spells developing.
Chance of cloud-free hill tops
40% at first, increasing to 85% by midday.
Low cloud and visibility
Cloud covering hills above 500-600m at first, rising above summits by mid-morning. Scattered cloud obscuring summits above 600m in any wintry showers. Away from cloud visibility, excellent falling to several kilometres in showers, and perhaps a kilometre in snow.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Dry with long clear spells overnight then a largely dry day with some long spells of sunshine, just the odd snow showers, with sleet or rain at lowers levels, possible.
Chance of cloud-free hill tops
Close to 100% at first and again later, otherwise 75% through the middle of the day.
Maximum wind speed expected
Northeasterly 20mph increasing to 25mph during the afternoon with gusts 30-35mph.
Temperature
- At 800m Around minus 05 Celsius, rising briefly close to zero by day
- Valley Around zero Celsius at dawn rising to plus 07 Celsius by day.
- Freezing level Around 450m, rising to around 750m by day
Low cloud and visibility
Little or no cloud below the summits at first, becoming occasional above 600-750m through the middle of the day. Away from cloud, visibility excellent falling briefly close to a kilometre in snow showers.
Mountain weather information
Fri 14 Mar
Sunrise:
Sunset:
Another cold day with long clear or sunny spells and just a few wintry showers around. Occasionally fresh northeasterly breeze. Freezing level 450m, rising to 750m by day
Sat 15 Mar
Sunrise:
Sunset:
Mainly dry with some long sunny spells. Moderate northeasterly winds. Freezing level around 450m rising to 750m.
Sun 16 Mar
Sunrise:
Sunset:
Another largely dry day with sunny spells, just the odd light shower, wintry on summits, possible. Mainly light northeasterly winds. Freezing level around 750m rising to just above the 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.