Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for generally settled conditions on Sunday and Monday but some uncertainty in patchy rain and cloud details. High for a change to much more unsettled and changeable conditions from Tuesday onwards.
This evening forecast
Mainly cloudy with extensive hill fog and the odd spot of light rain possible. Some clear intervals across the far north of the Park on lower slopes. Light southerly winds. Freezing level above summits.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Extensive hill fog and patchy rain in morning. Cloud lifting with a little brightness in afternoon. Light winds.
| 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) |
30% | 30% | 30% | 30% | 30% | 30% | 30% | 30% |
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
14
|
SE
16
|
SE
13
|
SE
15
|
S
16
|
S
16
|
S
16
|
S
16
|
| 600m |
S
8
|
S
8
|
S
8
|
S
9
|
S
12
|
S
13
|
S
10
|
S
9
|
| 300m |
SE
4
|
SE
4
|
SE
3
|
SE
5
|
S
7
|
S
9
|
S
5
|
SE
4
|
| Valley |
SE
4
|
SE
4
|
SE
3
|
S
5
|
S
7
|
S
9
|
S
5
|
SE
4
|
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 | 16 | 19 | 15 | 18 | 21 | 21 | 19 | 19 |
| 600m | 11 | 11 | 11 | 13 | 17 | 18 | 14 | 14 |
| 300m | 7 | 6 | 7 | 9 | 13 | 15 | 11 | 10 |
| Valley | 7 | 7 | 7 | 9 | 13 | 15 | 11 | 9 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
1°
|
2°
|
2°
|
3°
|
4°
|
5°
|
5°
|
5°
|
| 600m |
3°
|
3°
|
4°
|
5°
|
6°
|
7°
|
7°
|
7°
|
| 300m |
5°
|
5°
|
6°
|
7°
|
8°
|
9°
|
9°
|
8°
|
| Valley |
6°
|
6°
|
6°
|
8°
|
10°
|
11°
|
10°
|
9°
|
| Freezing Level |
1,000m
|
1,400m
|
1,600m
|
1,700m
|
1,600m
|
1,700m
|
1,800m
|
1,700m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-4°
|
-3°
|
-2°
|
-1°
|
0°
|
0°
|
1°
|
0°
|
| 600m |
0°
|
0°
|
1°
|
2°
|
3°
|
4°
|
4°
|
4°
|
| 300m |
3°
|
4°
|
4°
|
5°
|
6°
|
7°
|
8°
|
7°
|
| Valley |
4°
|
4°
|
5°
|
6°
|
8°
|
9°
|
9°
|
9°
|
Additional weather information
Meteorologist's view
Difficult conditions for route-finding in the fog, especially during the morning, but cloud lifting to high summits in the afternoon. Note that it will still feel cold on the tops, especially in the fog, so full warm and waterproof clothing will be required.
Weather
Extensive low cloud overnight with patchy light rain or drizzle. Sunday remaining largely cloudy with patchy light rain or drizzle. A misty and murky start but some fleeting brightness is possible in the afternoon as the cloud lifts.
Chance of cloud-free hill tops
Nil chance overnight and early morning, becoming 60% in afternoon.
Low cloud and visibility
Extensive cloud and fog from low slopes upwards overnight and to start the morning. Cloud slowly lifting to leave patches above 600m through the afternoon. Visibility under the cloud base becoming mainly good by afternoon with just brief reductions in patchy rain or drizzle.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Cloudy and mild with patchy light rain or drizzle in the morning. A few bright or clear spells developing in the afternoon and evening.
Chance of cloud-free hill tops
30%, becoming 70% in afternoon.
Maximum wind speed expected
South or Southwest 10 to 15mph, increasing to 25mph gusts 35mph in evening.
Temperature
- At 800m Plus 5C rising to 8C.
- Valley Plus 8C rising to 13 or 14C.
- Freezing level Above summits.
Low cloud and visibility
Extensive cloud and fog above 400 or 500m, lifting off the summits at times in the afternoon. Below the cloud base visibility rather hazy, reducing to a few km at times in rain or drizzle.
Mountain weather information
Tue 10 Mar
Sunrise:
Sunset:
Largely cloudy with patchy rain and hill fog but some brightness developing in the afternoon. Strong southwesterly winds on the tops later. Freezing level above summits.
Wed 11 Mar
Sunrise:
Sunset:
Heavy rain overnight, clearing early morning. A brighter and colder day long sunny spells. Strong west or southwest winds, gales early and late. Freezing level 900m.
Thu 12 Mar
Sunrise:
Sunset:
Very unsettled with showers or longer spells of rain, heavy at times with snow possible on the tops. Strong or gale force winds are likely.
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.