Mountain weather
Snowdonia Mountain weather forecast table
Confidence
High for a dry settled spell, medium for cloud amounts and extent of fog at lower levels.
This evening forecast
Mostly dry with some clear spells, perhaps the odd light shower which could be wintry on the Snowdon summit. There may be the odd shallow fog patch in the valleys. Mostly light winds.
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.
Mountain weather forecast
Mainly dry with some sunshine at times, the odd light shower possible. Light winds.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | 20% | 10% | 10% | 10% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
W
15
|
W
14
|
W
12
|
W
11
|
W
11
|
W
9
|
W
8
|
W
7
|
| 600m |
SW
9
|
SW
8
|
SW
7
|
SW
6
|
W
7
|
W
5
|
W
5
|
SW
3
|
| 300m |
SW
5
|
SW
5
|
SW
2
|
SW
2
|
W
5
|
W
3
|
W
2
|
SW
2
|
| Valley |
SW
6
|
SW
5
|
SW
3
|
W
3
|
W
6
|
W
4
|
W
2
|
S
3
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m | 18 | 17 | 15 | 13 | 14 | 12 | 11 | 9 |
| 600m | 11 | 11 | 9 | 8 | 11 | 8 | 7 | 5 |
| 300m | 9 | 9 | 6 | 6 | 9 | 7 | 4 | 4 |
| Valley | 10 | 10 | 7 | 7 | 10 | 7 | 4 | 4 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
1°
|
1°
|
1°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| 600m |
3°
|
3°
|
3°
|
3°
|
4°
|
4°
|
3°
|
3°
|
| 300m |
5°
|
5°
|
5°
|
5°
|
7°
|
7°
|
5°
|
4°
|
| Valley |
6°
|
6°
|
6°
|
6°
|
8°
|
8°
|
6°
|
6°
|
| Freezing Level |
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
-4°
|
-4°
|
-4°
|
-3°
|
-2°
|
-2°
|
-3°
|
-3°
|
| 600m |
0°
|
0°
|
0°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| 300m |
3°
|
4°
|
4°
|
4°
|
5°
|
6°
|
4°
|
4°
|
| Valley |
5°
|
5°
|
5°
|
5°
|
7°
|
7°
|
5°
|
5°
|
Additional weather information
Meteorologist's view
Nothing to add
Weather
Mostly dry with some clear or sunny spells. The odd light shower is possible which would be wintry on the highest summits. There may also be a few shallow fog patches in the valleys.
Chance of cloud-free mountain/hill tops at 800m
60% - often clear but some patchy summit cloud, especially in the morning.
Visibility
Very good except in any low level fog patches.
Ground conditions
Please see - https://www.eryri.llyw.cymru/visiting/walking/ground-conditions
Mountain weather information
Weather
A dry day with some sunny spells. Perhaps some valley fog patches, and also the chance of some fairly low cloud spreading into the lower foothills of the east in the evening.
Chance of cloud-free mountain/hill tops at 800m
90%, falling 70% in evening. Low cloud may be below 600m but could reach some of the lower eastern summits.
Maximum wind speed expected
Easterly 10-15mph
Temperature
- At 800m Minus 1 Celsius
- Valley 0 Celsius rising to Plus 5 Celsius in the afternoon.
- Freezing level 600m
Visibility
Away from valley fog mostly very good.
Mountain weather information
Saturday 28 November
Sunrise:
Sunset:
Another dry day with some sunny spells. Still the ongoing chance of a few freezing fog patches in the valleys.. Mostly light winds lower down but a moderate easterly over the hilltops.
Sunday 29 November
Sunrise:
Sunset:
The settled conditions continuing with a good deal of clear dry and sunny weather. Light winds with the main freezing level around 700m but with some frost and freezing fog patches in the valleys too.
Monday 30 November
Sunrise:
Sunset:
Another dry sunny day.
Updated at:
Mountain summits
Other points of interest
Cluster of multiple stations
The Snowdonia mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Snowdon, standing at 1,085 metres.
The region can be divided into four areas with the northernmost area the most popular, including peaks such as Moel Hebog, Mynydd Mawr and the Nantlle Ridge. Many hikers tend to concentrate on Snowdon itself regarding it as a fine mountain. However it can become quite crowded, with the peak welcoming around half a million visitors every year, of which four fifths scale the peak on foot, while the remainder choose to take the train instead.
One of Snowdon’s main attractions is the sheer number and variety of paths that reach the peak. This means that everyone from mountaineering novices to climbing experts should find a way up the mountain that will suit their abilities or provide them with a sufficient test. The easiest is the Llanberis path which, being the longest, has the most shallow ascent. In contrast, the Watkin Path is widely seen as being the most demanding ascent, despite also being considered the prettiest.