Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Generally high but moderate for the risk of showers on Thursday and Friday and low for the coming weekend in terms of details of rain.
This evening forecast
Showers easing then largely cloudy.
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
Mainly cloudy with showers, more so in the afternoon.
| 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) |
60% | 60% | 40% | 40% | 70% | 70% | 80% | 70% |
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
11
|
SE
15
|
S
18
|
S
16
|
S
18
|
SW
16
|
SW
17
|
S
17
|
| 600m |
S
9
|
SE
11
|
S
12
|
S
13
|
S
16
|
SW
14
|
S
13
|
S
12
|
| 300m |
SE
5
|
SE
7
|
S
8
|
S
11
|
S
12
|
SW
9
|
S
9
|
S
8
|
| Valley |
SE
5
|
SE
8
|
S
9
|
S
11
|
S
12
|
SW
9
|
S
9
|
S
7
|
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 | 14 | 18 | 23 | 21 | 24 | 23 | 22 | 21 |
| 600m | 11 | 15 | 17 | 19 | 22 | 20 | 18 | 15 |
| 300m | 9 | 13 | 16 | 17 | 20 | 17 | 15 | 13 |
| Valley | 9 | 14 | 17 | 17 | 19 | 16 | 15 | 13 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
3°
|
2°
|
2°
|
4°
|
5°
|
5°
|
4°
|
3°
|
| 600m |
5°
|
5°
|
5°
|
6°
|
7°
|
8°
|
7°
|
5°
|
| 300m |
7°
|
6°
|
7°
|
9°
|
10°
|
10°
|
9°
|
8°
|
| Valley |
8°
|
8°
|
8°
|
11°
|
12°
|
12°
|
11°
|
9°
|
| Freezing Level |
1,300m
|
1,200m
|
1,200m
|
1,300m
|
1,400m
|
1,400m
|
1,400m
|
1,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-1°
|
-3°
|
-3°
|
-1°
|
0°
|
0°
|
0°
|
-2°
|
| 600m |
2°
|
1°
|
1°
|
2°
|
3°
|
4°
|
3°
|
2°
|
| 300m |
6°
|
4°
|
5°
|
6°
|
7°
|
8°
|
7°
|
5°
|
| Valley |
7°
|
6°
|
6°
|
8°
|
9°
|
10°
|
9°
|
7°
|
Additional weather information
Meteorologist's view
Feeling chilly for early May, with layers advised. UV levels will be moderate to high through the midday hours, despite the cloud cover, so skin protection is advised.
Weather
Perhaps some early morning sunshine, but tending to quickly cloud over and thereafter remaining rather often cloudy for the rest of the day. A risk of showers breaking out, especially from mid-morning and into the evening, these becoming prolonged and heavy in places and confined to mainly west of the park before pushing eastwards later.
Chance of cloud-free hill tops
60% to start, rising to 80% but dropping back to 60% in showers.
Low cloud and visibility
Patchy cloud above 700-800m may form in association with afternoon and evening showers, but peaks will probably remain cloud free for large parts of the day. Very good visibility but dropping to poor in and around any heavy downpours briefly.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Low cloud and hill fog to start, then a similar day to Thursday with occasional bright or sunny spells but also showers throughout. Heaviest and most frequent during the afternoon with the risk of thunder, but lower confidence in exact positioning.
Chance of cloud-free hill tops
60% rising to 80% by mid-morning.
Maximum wind speed expected
Southerly 10-15mph, becoming northwesterly 15 mph.
Temperature
- At 800m Plus 4 Celsius rising to plus 8 Celsius.
- Valley Plus 8 Celsius rising to plus 13 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Patchy cloud around 700-800 m gradually lifting and clearing the summits. Poor or very poor visibility in any cloud/hill fog or showers, but otherwise generally very good visibility with far reaching views of surrounding peaks.
Mountain weather information
Sat 9 May
Sunrise:
Sunset:
Largely dry with sunny spells. Risk of heavy showers or longer spells of rain during the late afternoon and into the evening. Warm in the sun with fresh easterly winds.
Sun 10 May
Sunrise:
Sunset:
Murky with low cloud and hill fog, gradually lifting leaving a mostly dry albeit cloudy afternoon. Cooler with brisk northeasterly winds.
Mon 11 May
Sunrise:
Sunset:
Feeling cooler with longer spells of rain possible. Brisk northwesterly 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.