Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for dry and settled conditions today, moderate for extent of any overnight low cloud and fog.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Plenty of fine weather with light winds.
| 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% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
SE
9
|
S
8
|
SW
6
|
W
6
|
S
6
|
E
7
|
| 600m |
S
8
|
S
9
|
SW
6
|
W
6
|
N
4
|
SE
6
|
| 300m |
SE
5
|
S
6
|
W
4
|
W
5
|
W
2
|
SE
3
|
| Valley |
SE
5
|
S
6
|
W
4
|
NW
5
|
NW
2
|
S
3
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m | 10 | 11 | 9 | 10 | 9 | 8 |
| 600m | 10 | 12 | 9 | 10 | 6 | 7 |
| 300m | 7 | 10 | 7 | 8 | 4 | 5 |
| Valley | 7 | 9 | 7 | 9 | 4 | 5 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
12°
|
12°
|
13°
|
14°
|
14°
|
12°
|
| 600m |
14°
|
14°
|
16°
|
16°
|
16°
|
14°
|
| 300m |
16°
|
17°
|
18°
|
18°
|
18°
|
15°
|
| Valley |
16°
|
18°
|
19°
|
19°
|
18°
|
15°
|
| Freezing Level |
2,200m
|
2,200m
|
2,200m
|
2,300m
|
2,500m
|
2,500m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
11°
|
11°
|
13°
|
12°
|
12°
|
11°
|
| 600m |
13°
|
13°
|
15°
|
15°
|
15°
|
13°
|
| 300m |
15°
|
16°
|
18°
|
18°
|
18°
|
15°
|
| Valley |
15°
|
18°
|
19°
|
18°
|
18°
|
15°
|
Additional weather information
Meteorologist's view
Feeling warm with light winds, but cooler wind across summits. Protection from UV advised, despite the high cloud.
Weather
Any early mist or fog quickly clears, then dry and fine but with often large amounts of high cloud, although some bright or sunny intervals will occur. Feeling warm this afternoon with generally light winds.
Chance of cloud-free hill tops
95% or more but 60% at first.
Low cloud and visibility
Cloud bases well above summits. Isolated patches of mist and fog in the valleys are possible at first, bringing temporarily locally moderate or poor visibility. Otherwise visibility will be generally very good across the Park with distant hills clearly visible.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Fine and settled weather continuing. Despite often large amounts of high cloud there is a high risk of strong sunlight.
Chance of cloud-free hill tops
Greater than 90% for much of the day.
Maximum wind speed expected
Southerly around 25mph.
Temperature
- At 800m Plus 11 Celsius becoming Plus 15 Celsius.
- Valley Plus 13 Celsius becoming Plus 22 Celsius.
- Freezing level Well above summits.
Low cloud and visibility
Cloud bases probably remaining well above summits with very good visibility by afternoon.
Mountain weather information
Sun 12 May
Sunrise:
Sunset:
A fine start to the day with increasing cloud through the morning ahead of some thundery outbreaks of rain though the afternoon. Moderate south or southeasterly winds. Freezing level well above summits.
Mon 13 May
Sunrise:
Sunset:
Feeling cooler than of late as heavy and possibly thundery rain moves northeast across Snowdonia. Drier conditions arrive later, perhaps areas of hill fog. Moderate south or southeasterly winds. Freezing level well above summits.
Tue 14 May
Sunrise:
Sunset:
Another cooler and unsettled day with brisk winds from the SW and further showers or longer spells of rain.
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.