Mountain weather
Eryri / Snowdonia
Confidence
High for a switch to more changeable conditions but low for precipitation detail throughout.
-
Mon 3 AugSunrise:Sunset:
-
Tue 4 AugSunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Poor Visibility
Thunderstorms
Mountain weather forecast
A dry start to the day with the risk of rain developing through the afternoon and evening.
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols |  |
|
 |
 |
 |
|
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
10%
|
10%
|
10%
|
30%
|
60%
|
60%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | SE 22mph knots
SE
22mph |
SE 26mph knots
SE
26mph |
SE 17mph knots
SE
17mph |
SW 11mph knots
SW
11mph |
SE 16mph knots
SE
16mph |
SE 17mph knots
SE
17mph |
|
600m
|
600m | SE 15mph knots
SE
15mph |
SE 16mph knots
SE
16mph |
S 14mph knots
S
14mph |
SW 10mph knots
SW
10mph |
SE 9mph knots
SE
9mph |
SE 10mph knots
SE
10mph |
|
300m
|
300m | SE 10mph knots
SE
10mph |
SE 11mph knots
SE
11mph |
S 11mph knots
S
11mph |
SW 7mph knots
SW
7mph |
SW 4mph knots
SW
4mph |
SE 5mph knots
SE
5mph |
|
Valley
|
Valley | SE 10mph knots
SE
10mph |
SE 11mph knots
SE
11mph |
SE 11mph knots
SE
11mph |
SW 7mph knots
SW
7mph |
SW 4mph knots
SW
4mph |
SE 4mph knots
SE
4mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | 26mph | 31mph | 22mph | 14mph | 19mph | 21mph |
|
600m
|
600m | 19mph | 21mph | 19mph | 14mph | 11mph | 14mph |
|
300m
|
300m | 19mph | 18mph | 17mph | 10mph | 7mph | 10mph |
|
Valley
|
Valley | 19mph | 19mph | 17mph | 11mph | 7mph | 9mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||
|
600m
|
600m | ||||||
|
300m
|
300m | ||||||
|
Valley
|
Valley | ||||||
| Freezing Level | Freezing Level |
2300m
|
2500m
|
2700m
|
3000m
|
3500m
|
3600m
|
Additional weather information
Meteorologist's view
A fine morning for hill walking with plenty of dry and bright weather as well as light to moderate winds. Plenty of strong August sunshine throughout the day so remember to protect your skin from the strong sunshine as UV levels will be high. It will also turn increasingly warm and humid so plenty of water is advised. Through the afternoon the potential for rain develops and makes taking waterproofs advisable.
Weather
A very warm and increasingly humid day with a mixture of cloud and bright or sunny spells particularly through the morning. Rain developing later with the potential for heavier downpours at times through the later afternoon and evening. Low risk of thundery downpours during the evening. Light to moderate easterly winds, turning light and variable.
Chance of cloud-free hill tops
Greater than 95%.
Low cloud and visibility
All cloud is expected to be above the summits. Very good visibility with views of distant peaks possible. Visibilities may become poor or moderate in rain.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy start to Tuesday with scattered showers likely, these potentially heavy and thundery at times, Cloud lifting somewhat through the afternoon with showers becoming more scattered in nature. Another warm and humid day ahead with a light to moderate south-westerly breeze.
Chance of cloud-free hill tops
20% rising to 60%.
Maximum wind speed expected
Southwesterly 20-25mph.
Temperature
- At 800m Plus 12 Celsius rising to Plus 17 Celsius.
- Valley Plus 16 Celsius rising to Plus 24 Celsius.
- Freezing level above summits.
Low cloud and visibility
Cloud bases initially above 400m, with showers, potentially heavy, through the morning. Cloud bases are expected to rise above summits through the afternoon however some cloud may linger across highest peaks and in the west throughout. Visibilities initially poor on higher routes in low cloud and hill fog, good visibilities outside cloud. Once cloud bases lift visibilities are expected to be good or very good with moderate or poor visibilities at times in passing cloud. Visibilities potentially falling moderate or poor at times in showers throughout the day.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Wed 5 Aug
A changeable day is likely with a chance of showers, perhaps heavy. Showers dying out through the afternoon. Winds perhaps changing to a north-westerly direction and staying light to moderate.
Thu 6 Aug
A generally dry day with variable cloud around throughout. The odd light shower cannot be ruled out. Light to moderate north-westerly winds.
Fri 7 Aug
Another day of variable cloud and scattered showers with light to moderate westerly winds.
Mountain weather information
Wed 5 Aug
A changeable day is likely with a chance of showers, perhaps heavy. Showers dying out through the afternoon. Winds perhaps changing to a north-westerly direction and staying light to moderate.
Thu 6 Aug
A generally dry day with variable cloud around throughout. The odd light shower cannot be ruled out. Light to moderate north-westerly winds.
Fri 7 Aug
Another day of variable cloud and scattered showers with light to moderate westerly winds.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations