Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High confidence for Thursday being dry and bright, moderate confidence in details of rain Thursday evening. Confidence lowers for details into the bank holiday weekend.
This evening forecast
Patchy rain and cloud clearing quickly with clear skies and dry conditions developing.
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.
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
Dry and bright to start with light winds. Rain arriving from the west later.
| 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) |
00% | 00% | 00% | 00% | 00% | 00% | 40% | 60% |
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 |
NW
22
|
NW
16
|
NW
11
|
NW
7
|
SW
11
|
SW
16
|
SW
21
|
SW
30
|
| 600m |
NW
11
|
NW
8
|
NW
6
|
NW
5
|
SW
10
|
SW
14
|
SW
17
|
S
21
|
| 300m |
NW
7
|
NW
4
|
NW
3
|
NW
4
|
SW
8
|
SW
11
|
SW
13
|
S
15
|
| Valley |
NW
7
|
NW
5
|
W
3
|
NW
4
|
W
7
|
W
9
|
SW
11
|
S
14
|
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 | 27 | 20 | 14 | 11 | 16 | 23 | 29 | 40 |
| 600m | 16 | 12 | 9 | 9 | 15 | 21 | 25 | 30 |
| 300m | 15 | 10 | 7 | 7 | 14 | 19 | 22 | 28 |
| Valley | 16 | 11 | 8 | 7 | 13 | 16 | 20 | 25 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
0°
|
-1°
|
-2°
|
0°
|
1°
|
1°
|
0°
|
0°
|
| 600m |
2°
|
1°
|
1°
|
2°
|
4°
|
4°
|
3°
|
3°
|
| 300m |
4°
|
3°
|
2°
|
5°
|
7°
|
6°
|
5°
|
5°
|
| Valley |
5°
|
5°
|
4°
|
6°
|
8°
|
8°
|
7°
|
6°
|
| Freezing Level |
800m
|
800m
|
700m
|
700m
|
800m
|
800m
|
800m
|
1,000m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 900m |
-8°
|
-7°
|
-6°
|
-4°
|
-3°
|
-4°
|
-6°
|
-7°
|
| 600m |
-3°
|
-2°
|
-2°
|
0°
|
0°
|
-1°
|
-3°
|
-3°
|
| 300m |
1°
|
2°
|
1°
|
3°
|
4°
|
3°
|
1°
|
1°
|
| Valley |
3°
|
3°
|
3°
|
5°
|
6°
|
6°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
A lovely day for hill walking and hiking with bright skies and clear views to distant hills. Feeling mild in the valleys with multiple layers still recommended for the summits with feels like temperatures as low of minus 6 Celsius.
Weather
Some foggy patches across highest peaks likely through the first part of Thursday quickly clearing away after dawn. This will leave a dry and bright picture with sunny spells for much of Thursday. Rain is expected to arrive from the west through the evening, potentially turning heavier after nightfall.
Chance of cloud-free hill tops
20% becoming 80% during the morning, lowering to 30% after dusk once rain arrives.
Low cloud and visibility
Patchy cloud above 800 m, quickly clearing after dawn. Very poor visibility within any cloud but generally excellent with distant hills visible.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Remaining unsettled overnight and into Friday daytime. Outbreaks of rain and low cloud likely through much of the day. Persistent rain turning to showers through the afternoon with drier and clearer spells developing by evening.
Chance of cloud-free hill tops
10% becoming 30% through the afternoon.
Maximum wind speed expected
West or southwesterly 30-40 mph, with gusts reaching 40-45 mph.
Temperature
- At 800m Plus 2 Celsius.
- Valley Plus 9 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Very poor or poor visibility with low cloud and hill fog likely above 300-500m, poorest visibilities likely particularly on windward slopes. Becoming occasional cloud above 600m by evening.
Mountain weather information
Sat 4 Apr
Sunrise:
Sunset:
A drier start to the day with outbreaks of light rain and drizzle through the afternoon, turning more showery in nature through the afternoon. Light winds to start increasing to a strong south-southwesterly wind with potential for gale force gusts later.
Sun 5 Apr
Sunrise:
Sunset:
A colder day with sunny spells and scattered showers, potentially wintry on summits, likely throughout. Strong to gale force winds easing through the early hours, decreasing to a light westerly after dawn.
Mon 6 Apr
Sunrise:
Sunset:
Settled conditions returning for the day with plenty of sunshine and excellent visibilities, sunshine potentially turning hazy later. Moderate southerly 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.