Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for a cloudy and wet couple of days, before turning colder from the north later on Thursday. Low confidence for the timing of any transition from rain to snow, and also extent of any snow later Thursday and Friday. High confidence for a briefly dry, but cold day Saturday, before milder air spreads east. Moderate confidence for the timing of this, but low with the precipitation detail, including extent of any snowfall.
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.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Mountain weather forecast
Largely overcast, wet, and feeling cold.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
60% | 60% | 60% | 60% | 60% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
W
15
|
SW
19
|
SW
23
|
SW
26
|
SW
23
|
S
18
|
| 600m |
SW
10
|
S
14
|
SW
17
|
SW
18
|
S
16
|
S
12
|
| 300m |
SW
4
|
S
7
|
SW
10
|
SW
11
|
S
9
|
S
7
|
| Valley |
SW
4
|
S
7
|
SW
10
|
SW
11
|
S
9
|
S
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 17 | 23 | 28 | 31 | 27 | 22 |
| 600m | 12 | 17 | 22 | 24 | 20 | 15 |
| 300m | 9 | 14 | 18 | 20 | 17 | 13 |
| Valley | 9 | 13 | 18 | 19 | 17 | 13 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
4°
|
4°
|
4°
|
4°
|
3°
|
3°
|
| 600m |
6°
|
6°
|
6°
|
6°
|
5°
|
5°
|
| 300m |
7°
|
7°
|
8°
|
8°
|
7°
|
6°
|
| Valley |
8°
|
8°
|
9°
|
9°
|
8°
|
8°
|
| Freezing Level |
1,400m
|
1,600m
|
1,500m
|
1,400m
|
1,400m
|
1,400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
-1°
|
-2°
|
-3°
|
-3°
|
-2°
|
| 600m |
2°
|
2°
|
2°
|
1°
|
1°
|
1°
|
| 300m |
6°
|
5°
|
5°
|
4°
|
4°
|
4°
|
| Valley |
7°
|
6°
|
7°
|
6°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
With higher routes largely shrouded in cloud, good navigation skills will be required. Along with the rain, it will also be feeling sub-zero on the tops despite relatively light winds, so warm waterproof layers will be essential.
Weather
A rather overcast day, with many hill summits obscured with cloud and frequent outbreaks of rain and drizzle. Rain will be mostly light, but with some heavier bursts, especially during the morning. The best chance of any drier intervals later in the day.
Chance of cloud-free hill tops
Near zero at first, improving to 30% in the afternoon, mainly in the east.
Low cloud and visibility
Areas of cloud will obscure summits and routes above 800m for much of the day, but some breaks are possible by the afternoon, mainly in the east. Spells of rain and drizzle could see cloud drop to cover some hills down to 400m at times. Visibility will be moderate to poor, though drier intervals could allow for some good views to develop.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Another cloudy and wet day, with frequent and occasionally heavy outbreaks of rain. Rain turning to snow above 700m during the evening as colder air moves in.
Chance of cloud-free hill tops
20%
Maximum wind speed expected
Northeasterly 20mph gust 30mph
Temperature
- At 800m Plus 2 Celsius at first, falling to Minus 1 Celsius after dark.
- Valley Plus 6 Celsius rising to Plus 9 Celsius
- Freezing level Above summits, falling after dark to 800m by midnight.
Low cloud and visibility
Widespread cloud obscuring routes above 800m, with some patches of cloud likely down to 500m during any more persistent or heavier rain, or evening snow. Visibility will be moderate to poor, and turning very poor on the summits in any evening snow.
Mountain weather information
Fri 13 Feb
Sunrise:
Sunset:
Cold start, with higher routes frozen as freezing levels fall to 300m. Rain will gradually ease, but also turning increasingly to snow above this level, before clearing to sunny spells and showers.
Sat 14 Feb
Sunrise:
Sunset:
Icy start, with freezing level below 200m, and isolated snow showers. Otherwise dry with some sunshine, before higher cloud moves in. Brief snow after dark, but turning to rain as freezing levels rise to 1000m.
Sun 15 Feb
Sunrise:
Sunset:
Wet, windy for a time during the morning, but clearing to sunny spells and isolated showers. Freezing level rising above summits for much of the day, perhaps falling to 1000m later.
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.