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 and strength of winds.
This evening forecast
Largely cloudy and dry with occasional bursts of sunshine in places this evening.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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, sunny intervals developing. Low risk of a light shower.
| 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) |
30% | 60% | 30% | 30% | 20% | 20% | 20% | 20% |
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 |
E
16
|
E
14
|
E
12
|
E
11
|
SE
9
|
S
5
|
SW
7
|
S
10
|
| 600m |
E
10
|
E
11
|
E
10
|
E
9
|
SE
6
|
W
4
|
SW
6
|
S
8
|
| 300m |
E
8
|
E
9
|
E
8
|
E
8
|
NE
5
|
W
4
|
SW
4
|
S
3
|
| Valley |
E
8
|
E
8
|
E
8
|
E
8
|
NE
5
|
N
4
|
NW
4
|
S
3
|
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 | 20 | 20 | 16 | 15 | 12 | 7 | 10 | 12 |
| 600m | 17 | 19 | 15 | 13 | 9 | 7 | 8 | 10 |
| 300m | 15 | 17 | 15 | 13 | 8 | 6 | 6 | 7 |
| Valley | 15 | 17 | 15 | 12 | 8 | 6 | 6 | 7 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
2°
|
1°
|
1°
|
2°
|
4°
|
4°
|
4°
|
3°
|
| 600m |
4°
|
4°
|
4°
|
5°
|
6°
|
7°
|
7°
|
5°
|
| 300m |
7°
|
6°
|
6°
|
8°
|
9°
|
10°
|
10°
|
8°
|
| Valley |
8°
|
7°
|
7°
|
9°
|
10°
|
11°
|
11°
|
9°
|
| Freezing Level |
1,300m
|
1,200m
|
1,200m
|
1,100m
|
1,100m
|
1,300m
|
1,300m
|
1,300m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-3°
|
-4°
|
-4°
|
-3°
|
0°
|
2°
|
2°
|
0°
|
| 600m |
1°
|
0°
|
0°
|
1°
|
4°
|
6°
|
5°
|
3°
|
| 300m |
4°
|
3°
|
3°
|
5°
|
8°
|
9°
|
9°
|
7°
|
| Valley |
6°
|
5°
|
5°
|
7°
|
10°
|
10°
|
10°
|
8°
|
Additional weather information
Meteorologist's view
Feeling cold for early May with brisk winds on the summits through the morning giving a significant wind chill. Extra layers of clothing are advised. UV levels will be moderate to high through the midday hours, despite the cloud cover, so skin protection is advised.
Weather
Showers are possible through the early hours but these fading after dawn to leave a mainly dry day. Large amounts of cloud throughout much of Wednesday with occasional brighter periods and fleeting sunny intervals. A small chance of localised shower, these generally fairly light.
Chance of cloud-free hill tops
40% becoming 70%.
Low cloud and visibility
Periods of cloud above 700-800m, gradually lifting and clearing the summits. Poor or very poor visibility in any cloud/hill fog but otherwise generally very good visibility with far reaching views of surrounding peaks.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Perhaps some early morning sunshine, but tending to quickly cloud over and thereafter remaining rather cloudy for the rest of the day. A greater risk of showers breaking out, especially late afternoon and into the evening, these becoming prolonged and heavy in places. There is considerable uncertainty regarding their location and some parts of the National Park will likely remain dry.
Chance of cloud-free hill tops
70%
Maximum wind speed expected
Southerly 20-25 mph.
Temperature
- At 800m Plus 2 Celsius rising to plus 8 Celsius.
- Valley Plus 4 Celsius rising to plus 16 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Periods of 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.
Mountain weather information
Fri 8 May
Sunrise:
Sunset:
A similar day to Thursday with a mixture of sunny spells showers but a greater chance of heavy and thundery downpours developing. Feeling a little warmer with light to moderate southeasterly winds.
Sat 9 May
Sunrise:
Sunset:
Breezier with moderate to fresh easterly winds and a risk of showers. Uncertainty in the details but a possibility of a longer spell of heavy rain for a time.
Sun 10 May
Sunrise:
Sunset:
Probably unsettled with showers or more general rain, perhaps turning thundery. Moderate to fresh easterly 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.