Mountain weather
Snowdonia Mountain weather forecast table
Confidence
High confidence for a cloudier and windier day on Tuesday with some rain. Lower confidence thereafter in regards to cloud and rain through Wednesday and Thursday.
This evening forecast
Some late sunshine through the evening with some clear spells to start the night.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
Mountain weather forecast
Becoming increasingly cloudy on Tuesday with light rain, particularly across western areas, and turning increasingly windy.
| 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% | <05% | 10% | 50% | 60% | 70% | 70% | 80% |
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 |
S
14
|
S
20
|
S
27
|
SW
34
|
SW
41
|
SW
43
|
SW
43
|
SW
41
|
| 600m |
S
13
|
S
15
|
S
22
|
S
27
|
S
30
|
S
32
|
SW
33
|
SW
30
|
| 300m |
S
9
|
S
9
|
S
14
|
S
19
|
S
21
|
S
23
|
SW
22
|
SW
21
|
| Valley |
S
9
|
S
10
|
S
14
|
S
18
|
S
22
|
S
24
|
SW
22
|
SW
22
|
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 | 20 | 25 | 34 | 45 | 54 | 58 | 59 | 56 |
| 600m | 18 | 20 | 29 | 37 | 42 | 46 | 47 | 44 |
| 300m | 17 | 18 | 25 | 33 | 38 | 41 | 40 | 40 |
| Valley | 18 | 19 | 24 | 32 | 38 | 43 | 40 | 41 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
8°
|
7°
|
8°
|
8°
|
9°
|
10°
|
11°
|
10°
|
| 600m |
10°
|
9°
|
10°
|
10°
|
11°
|
12°
|
12°
|
12°
|
| 300m |
11°
|
11°
|
12°
|
13°
|
13°
|
14°
|
14°
|
14°
|
| Valley |
12°
|
12°
|
13°
|
14°
|
15°
|
15°
|
15°
|
16°
|
| Freezing Level |
2,000m
|
2,100m
|
3,300m
|
3,300m
|
3,200m
|
3,000m
|
2,600m
|
3,400m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
4°
|
3°
|
3°
|
2°
|
3°
|
5°
|
5°
|
5°
|
| 600m |
7°
|
6°
|
6°
|
6°
|
6°
|
7°
|
8°
|
8°
|
| 300m |
10°
|
9°
|
9°
|
9°
|
10°
|
10°
|
10°
|
11°
|
| Valley |
11°
|
11°
|
11°
|
11°
|
11°
|
11°
|
12°
|
12°
|
Additional weather information
Meteorologist's view
Strong winds over the summits in particular, with winds gusting close to 60 mph.
Weather
Increasingly cloudy on Tuesday, with low cloud forming on the summits and with intermittent light rain and drizzle developing by mid-morning. Remaining overcast through the rest of the day with further spells of light rain and drizzle at times, with the best of any drier interludes in sheltered northeastern parts of the mountains. Increasingly windy, with very strong winds developing over the summits.
Chance of cloud-free mountain/hill tops at 800m
80% overnight, falling to 30% by dawn, and then to 10% or less from mid-morning as extensive low cloud develops.
Visibility
Good at low levels initially, but becoming moderate occasionally poor in rain or drizzle, and very poor on higher routes.
Ground conditions
Please see - https://www.eryri.llyw.cymru/visiting/walking/ground-conditions
Mountain weather information
Weather
Cloud and rain to start the day with extensive low cloud and hill fog. This rain should clear northwards through the morning leaving some brightness before more rain arrives by evening.
Chance of cloud-free mountain/hill tops at 800m
Nil at first, rising to 30% by late morning.
Maximum wind speed expected
Southwesterly 45-50 mph.
Temperature
- At 800m 12 Celsius.
- Valley 18 Celsius.
- Freezing level Well above the summits.
Visibility
Moderate occasionally poor to start the day, and very poor on higher routes. Improving through the morning, possibly becoming good for a time across lower routes.
Mountain weather information
Thursday 6 August
Sunrise:
Sunset:
Cloud with further rain or drizzle through the morning, and fog over higher routes. Rain easing through the afternoon. Lighter winds. Freezing level well above the summits.
Friday 7 August
Sunrise:
Sunset:
A drier day to come with more in the way of sunshine. Small risk of an afternoon shower. Feeling warm, with freezing level well above the summits.
Saturday 8 August
Sunrise:
Sunset:
A fine day to come across Snowdonia with light winds and plenty of sunshine. Feeling warm, with freezing level well above the summits.
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.