Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Moderate for timing and extent of rain Saturday evening into Sunday. Low for potential of thunderstorms on Sunday.
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
Early hill fog lifting, but potential for rain later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
30% | 20% | 10% | 10% | 30% | 40% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
SW
19
|
SW
16
|
SW
12
|
SW
8
|
N
6
|
E
10
|
| 600m |
S
16
|
S
16
|
SW
14
|
SW
8
|
NW
5
|
NE
5
|
| 300m |
S
10
|
S
11
|
SW
10
|
SW
5
|
NW
4
|
NE
2
|
| Valley |
S
10
|
S
10
|
S
9
|
W
5
|
NW
4
|
NE
2
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m | 23 | 21 | 17 | 11 | 8 | 12 |
| 600m | 20 | 20 | 18 | 11 | 7 | 8 |
| 300m | 16 | 17 | 15 | 7 | 6 | 4 |
| Valley | 16 | 16 | 14 | 8 | 6 | 4 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
5°
|
5°
|
7°
|
8°
|
7°
|
6°
|
| 600m |
7°
|
7°
|
9°
|
10°
|
9°
|
9°
|
| 300m |
9°
|
10°
|
12°
|
12°
|
11°
|
10°
|
| Valley |
10°
|
12°
|
14°
|
13°
|
12°
|
11°
|
| Freezing Level |
1,700m
|
1,700m
|
1,700m
|
2,000m
|
2,000m
|
2,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 900m |
0°
|
1°
|
4°
|
5°
|
5°
|
4°
|
| 600m |
3°
|
4°
|
6°
|
8°
|
8°
|
8°
|
| 300m |
7°
|
8°
|
10°
|
11°
|
10°
|
10°
|
| Valley |
8°
|
10°
|
12°
|
12°
|
11°
|
11°
|
Additional weather information
Meteorologist's view
A mostly fine day to be out walking, though views from the summits will be disappointing at first until cloud lifts.
Weather
A cloudy day overall. This cloud thick enough to produce pockets of drizzle over the hills during the early morning, before lifting and allowing the afternoon to be drier with the chance of a few bright spells breaking through for a short time. Cloud building again later with the potential for outbreaks of rain to arrive into the evening, though their extent is uncertain.
Chance of cloud-free hill tops
40% at first, rising to 80% from the afternoon.
Low cloud and visibility
Early cloud as low as 400m over western slopes bringing poor visibility. Cloud rising above the summits by the afternoon, providing good visibility of surroundings for a time, before dropping again as rain arrives later.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A rather wet second day of the weekend. Rain and drizzle may turn persistent for a time during the morning before breaking into showers in the afternoon, with some showers turning heavy with the chance of thunder.
Chance of cloud-free hill tops
40% for much of the day, perhaps rising to 80% in the evening.
Maximum wind speed expected
20mph northerly winds on the hills.
Temperature
- At 800m Plus 6 Celsius, rising to plus 8 Celsius.
- Valley Plus 9 Celsius, rising to plus 14 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Poor visibility for much of the day in rain/drizzle and showers. Cloud regularly dropping to 400-500m throughout the day, most regularly on northern slopes. Cloud gradually lifting later, potentially rising above the summits into the evening.
Mountain weather information
Mon 4 May
Sunrise:
Sunset:
Predominantly fine with showers easing and a greater chance of bright or sunny spells emerging throughout the day. Moderate northerly winds.
Tue 5 May
Sunrise:
Sunset:
Early cloud lifting to leave a largely dry day with sunny spells. Moderate to fresh northerly winds on the hills. Feeling cooler with freezing levels dropping just above the summits.
Wed 6 May
Sunrise:
Sunset:
A bright day with sunny spells, though showers possibly arriving into the afternoon. Moderate northerly winds. Freezing level hovering around the summit.
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.