Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Generally high confidence though moderate for clearance of rain today, and low confidence for forecast detail from Sunday.
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.
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.
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
Low cloud and outbreaks of rain and drizzle throughout.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
30% | 30% | 30% | 40% | 60% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
S
8
|
S
12
|
S
12
|
SW
16
|
SW
19
|
SW
19
|
| 600m |
S
12
|
S
14
|
S
13
|
SW
15
|
SW
14
|
SW
13
|
| 300m |
S
10
|
S
12
|
S
11
|
SW
13
|
SW
10
|
SW
9
|
| Valley |
S
9
|
S
11
|
S
10
|
SW
12
|
SW
9
|
SW
9
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m | 10 | 17 | 16 | 23 | 25 | 25 |
| 600m | 15 | 19 | 19 | 22 | 20 | 19 |
| 300m | 15 | 18 | 18 | 21 | 17 | 16 |
| Valley | 15 | 18 | 17 | 20 | 17 | 16 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
6°
|
6°
|
6°
|
6°
|
5°
|
5°
|
| 600m |
8°
|
8°
|
8°
|
8°
|
7°
|
7°
|
| 300m |
9°
|
9°
|
10°
|
9°
|
9°
|
8°
|
| Valley |
10°
|
10°
|
11°
|
11°
|
10°
|
10°
|
| Freezing Level |
2,400m
|
2,300m
|
2,400m
|
2,400m
|
2,400m
|
2,400m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
4°
|
3°
|
3°
|
2°
|
1°
|
0°
|
| 600m |
4°
|
4°
|
5°
|
4°
|
4°
|
3°
|
| 300m |
6°
|
6°
|
7°
|
6°
|
6°
|
6°
|
| Valley |
8°
|
8°
|
9°
|
8°
|
8°
|
8°
|
Additional weather information
Meteorologist's view
Waterproofs required along the tops where it will likely feel cold and damp with outbreaks of rain and drizzle expected throughout. Navigation skills essential as visibility likely poor to very poor on the hills.
Weather
Low cloud likely shrouding the hills throughout with patchy drizzle along the tops, drizzle turning into more moderate, or perhaps heavy, bursts of rain through the afternoon and into the evening.
Chance of cloud-free hill tops
10%
Low cloud and visibility
Extensive low cloud down to approximately 300-500m likely throughout the day. Perhaps falling as low as 200m at times to the west and south of the park. Visibility moderate, poor or very poor in rain and drizzle.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Low cloud may continue to shroud the hills with outbreaks of showery rain. Cloud slowly lifting and moving northwards through the day with brighter conditions developing behind.
Chance of cloud-free hill tops
10% rising to 40% by afternoon and 90% by the evening.
Maximum wind speed expected
Southwest 10-15 mph with gusts of 25 mph
Temperature
- At 800m Plus 4 Celsius
- Valley Plus 8 Celsius rising to Plus 13 Celsius
- Freezing level Above Summits
Low cloud and visibility
Low cloud around 300-500 metres likely at first, slowly lifting throughout the day to be clear of the tops by the evening.
Mountain weather information
Sun 5 May
Sunrise:
Sunset:
Low confidence in forecast detail though generally staying unsettled with variable cloud and the potential for locally heavy showers Feeling warmer in any sunshine. Light and variable wind. Freezing levels above tops
Mon 6 May
Sunrise:
Sunset:
Low confidence in forecast detail. Variable cloud with sunny spells. Risk of heavy showers developing during the day. Light winds. Freezing level above summits.
Tue 7 May
Sunrise:
Sunset:
Showers remain possible, but expected to be drier than Monday with perhaps some good sunny periods though confidence remains low at this stage. Feeling warm in the sunshine with light, variable winds. Freezing levels above 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.