Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for dry and settled conditions. Medium at best for cloud details.
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
Variable and uncertain cloud amounts. Temperature inversion. Light winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | 10% | 10% | 10% | 10% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
SE
10
|
SE
11
|
SE
7
|
SE
8
|
E
10
|
E
8
|
| 600m |
SE
9
|
SE
7
|
S
7
|
NE
6
|
SE
6
|
SE
7
|
| 300m |
SE
5
|
SE
4
|
SE
4
|
N
4
|
SE
3
|
SE
4
|
| Valley |
SE
5
|
SE
4
|
SE
4
|
NW
4
|
E
3
|
SE
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 13 | 14 | 9 | 11 | 14 | 11 |
| 600m | 11 | 10 | 9 | 8 | 9 | 10 |
| 300m | 7 | 7 | 7 | 7 | 7 | 9 |
| Valley | 7 | 7 | 7 | 6 | 7 | 9 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
9°
|
8°
|
9°
|
10°
|
9°
|
8°
|
| 600m |
9°
|
10°
|
11°
|
12°
|
11°
|
10°
|
| 300m |
10°
|
12°
|
14°
|
14°
|
12°
|
12°
|
| Valley |
10°
|
12°
|
15°
|
15°
|
13°
|
13°
|
| Freezing Level |
2,600m
|
2,900m
|
2,900m
|
2,900m
|
2,800m
|
2,800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
6°
|
6°
|
8°
|
8°
|
6°
|
6°
|
| 600m |
7°
|
8°
|
10°
|
11°
|
10°
|
9°
|
| 300m |
9°
|
11°
|
14°
|
14°
|
12°
|
11°
|
| Valley |
9°
|
12°
|
15°
|
15°
|
13°
|
12°
|
Additional weather information
Meteorologist's view
Note uncertainty around cloud details.
Weather
Variable, perhaps extensive cloud. Bright and sunny spells should develop as any thicker cloud lifts and breaks and a temperature inversion around 800-900m could see the higher summits remain cloud free at times.
Chance of cloud-free hill tops
70%, note temperature inversion.
Low cloud and visibility
Occasional or extensive low cloud possible. Bases could be 300m or less at times, particularly early in the day, but should tend to lift and break. The temperature inversion around 800-900m could see the higher summits remain mostly cloud free. Visibility moderate to very poor in cloud, otherwise good or very good.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Similar to Monday with variable, perhaps extensive cloud overnight and during the day, but continuing uncertainty around cloud details. However, clear skies are possible which would allow fog to form in the valleys which would be slow to clear during the morning. Bright and sunny spells should develop as any thicker cloud lifts and breaks and a temperature inversion around 700m should see the higher summits remain cloud free throughout.
Chance of cloud-free hill tops
70%, note temperature inversion.
Maximum wind speed expected
East or Northeast 10mph.
Temperature
- At 800m Plus 5 to 10 Celsius
- Valley Plus 6 rising to 16 Celsius
- Freezing level Above the summits
Low cloud and visibility
Occasional or extensive low cloud possible, but details uncertain. Bases could be 300m or less at times, particularly early in the day, but should tend to lift and break. The temperature inversion around 700m should see the higher summit remain mostly cloud free. Visibility moderate to very poor in cloud, otherwise good or very good.
Mountain weather information
Wed 15 Oct
Sunrise:
Sunset:
Dry. Variable cloud. Sunny or clear spells possible, but cloud amounts uncertain. Temperature inversion possible below the summits. Light or moderate easterly winds at height.
Thu 16 Oct
Sunrise:
Sunset:
Dry. Variable cloud. Sunny or clear spells possible, but cloud amounts uncertain. Temperature inversion possible below the summits. Light or moderate easterly winds at height.
Fri 17 Oct
Sunrise:
Sunset:
Dry. Variable cloud. Sunny or clear spells possible, but cloud amounts uncertain. Temperature inversion possible below the summits. Light or moderate east or southeast winds at height.
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.