Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence in the overall story but only low to moderate for cloud amounts, also the distribution and intensity of the showers on Thursday.
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.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
Generally cloudy and dry.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
50% | 30% | 20% | 10% | 20% | 50% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
NW
16
|
NW
14
|
W
14
|
W
16
|
W
15
|
SW
14
|
| 600m |
NW
9
|
NW
11
|
W
12
|
W
13
|
SW
11
|
S
13
|
| 300m |
NW
6
|
NW
8
|
W
9
|
W
10
|
SW
5
|
S
8
|
| Valley |
NW
6
|
NW
8
|
W
10
|
W
10
|
SW
5
|
S
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 18 | 18 | 19 | 21 | 19 | 17 |
| 600m | 11 | 14 | 17 | 18 | 14 | 17 |
| 300m | 8 | 12 | 14 | 14 | 9 | 13 |
| Valley | 8 | 12 | 15 | 15 | 9 | 14 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
10°
|
11°
|
10°
|
10°
|
11°
|
12°
|
| 600m |
12°
|
12°
|
12°
|
13°
|
13°
|
14°
|
| 300m |
13°
|
14°
|
15°
|
16°
|
16°
|
15°
|
| Valley |
14°
|
16°
|
16°
|
17°
|
17°
|
16°
|
| Freezing Level |
3,400m
|
3,200m
|
2,500m
|
3,000m
|
3,100m
|
3,200m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
7°
|
8°
|
8°
|
8°
|
8°
|
9°
|
| 600m |
10°
|
11°
|
10°
|
11°
|
11°
|
11°
|
| 300m |
13°
|
13°
|
14°
|
14°
|
15°
|
14°
|
| Valley |
14°
|
15°
|
15°
|
16°
|
17°
|
15°
|
Additional weather information
Meteorologist's view
Some sunshine this afternoon but quite a windy day overall, with gusts more like 25-30mph on summits and ridges.
Weather
Starting cloudy and dry. Some drier and brighter conditions will develop this morning but it will stay fairly cloudy, with the best chance of any sunshine this afternoon across eastern area. Cloud will eventually roll in from the west later, bringing low cloud and outbreaks of rain this evening.
Chance of cloud-free hill tops
10-20% this morning, more like 70-80% this afternoon. Back to 10-20% in the evening.
Low cloud and visibility
Poor to very poor visibility in cloud through much of this morning, with base as low as 350-400m. Visibility slowly improving as cloud base rises above summits this afternoon to become very good or excellent, with distant hills clearly visible.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Showers or longer spells of rain overnight, these often heavy. Through the day becoming mainly dry and bright, with perhaps an odd heavy shower, and possibly some sunny spells. Dry through the evening, with a chance of clear spells developing, especially across southern areas.
Chance of cloud-free hill tops
20-30% at dawn but quickly becoming 95% or more.
Maximum wind speed expected
North-westerly 30mph with gusts up to 40-45mph.
Temperature
- At 800m Plus 13 Celsius falling to Plus 9 Celsius
- Valley Plus 14 Celsius rising to Plus 22 Celsius
- Freezing level Above summits
Low cloud and visibility
Poor to very poor visibility in cloud and rain around dawn, with cloud base as low as 500m. Visibility becoming very good to excellent in the afternoon, with distant hills clearly visible and cloud well above summits.
Mountain weather information
Fri 1 Aug
Sunrise:
Sunset:
Another fairly cloudy day, bright but with a chance of scattered showers, light though. Moderate north to northwesterly winds.
Sat 2 Aug
Sunrise:
Sunset:
Generally fine and dry although the odd shower cannot be ruled out in the morning. Sunny spells becoming more prevalent in the afternoon. Moderate west to west-northwesterly winds.
Sun 3 Aug
Sunrise:
Sunset:
Cloud and rain rapidly spreading from the west, followed by drier and brighter skies in the afternoon/evening. Moderate westerly winds.
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.