Eryri / Snowdonia Mountain weather forecast table
Confidence
Medium for the detail of worst conditions.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Poor Visibility
Thunderstorms
Heavy Persistent Rain
Heavy Persistent Snow
Gales
Mountain weather forecast
Largely cloudy with showers or longer spells of rain and summit snow into the day. Strong to gale force summit winds.
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
Weather (at 800m) |
||||||
Chance of precipitation (at 800m) |
80% | 20% | 70% | 80% | 80% | 80% |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
S
24
|
S
25
|
SE
29
|
SE
26
|
S
15
|
SW
30
|
600m |
S
18
|
S
19
|
SE
24
|
SE
20
|
S
10
|
SW
21
|
300m |
S
11
|
S
12
|
SE
18
|
SE
15
|
W
7
|
SW
14
|
Valley |
S
11
|
S
12
|
SE
17
|
SE
15
|
SW
7
|
SW
15
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m | 28 | 30 | 37 | 33 | 19 | 38 |
600m | 22 | 24 | 32 | 27 | 15 | 29 |
300m | 19 | 19 | 30 | 25 | 13 | 26 |
Valley | 19 | 20 | 29 | 25 | 13 | 27 |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
-2°
|
-2°
|
0°
|
1°
|
0°
|
0°
|
600m |
0°
|
1°
|
3°
|
4°
|
3°
|
2°
|
300m |
2°
|
3°
|
6°
|
6°
|
5°
|
4°
|
Valley |
3°
|
5°
|
8°
|
8°
|
7°
|
6°
|
Freezing Level |
600m
|
600m
|
900m
|
1,100m
|
1,000m
|
1,000m
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
-9°
|
-10°
|
-7°
|
-6°
|
-5°
|
-7°
|
600m |
-6°
|
-6°
|
-3°
|
-2°
|
-1°
|
-4°
|
300m |
-3°
|
-1°
|
2°
|
2°
|
2°
|
0°
|
Valley |
-1°
|
1°
|
4°
|
4°
|
4°
|
2°
|
Additional weather information
Meteorologist's view
Severe wind chill restricted above mid-level routes, but still a feeling cold at lower levels with frequent showers giving little time for conditions to dry into the afternoon.
Weather
Overnight rain and snow clearing north to start the day with some brighter spells into the morning. Cloud thickening into the afternoon however as strengthening winds bring frequent showers or longer periods of rain and sleet into the remainder of the day. These likely to turn heavy at times with the risk of thunder. Hail is likely at low levels and sleet or snow likely above around 600-700m initially, becoming restricted to above 800-900m by the latter afternoon.
Chance of cloud-free hill tops
20% initially, becoming 80% by mid-morning before lowering to 30% into the afternoon.
Low cloud and visibility
Widespread cloud above 200-300m initially, this tending to lift and break somewhat into the morning but thickens once again through the afternoon to give widespread cloud above 500-600m. Visibility generally good but becoming increasingly moderate or poor in rain, very poor in snow and within cloud.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Brighter spells and showers with outbreaks building into the afternoon, bringing a risk of hail and thunder. Snow level around 900m.
Chance of cloud-free hill tops
60% for any given time but very low for extended clear periods.
Maximum wind speed expected
South 20-25mph with gusts reaching 40mph across most exposed ridges and summits
Temperature
- At 800m Plus 2 Celsius
- Valley Plus 1 Celsius increasing 14 Celsius during the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor snow and within cloud with bases occasionally down to 600m.
Mountain weather information
Sat 30 Mar
Sunshine and some scattered showers, mostly light but some sharper ones developing for the afternoon. Southerly summit breezes easing light later. Freezing level above all summits.
Sun 31 Mar
Dry, sunny start. Cloud building from mid-day with increasing chance of rain later. Light winds. Freezing level above all summits.
Mon 1 Apr
Overcast with occasional rain, though most of this light. Freezing level above all summits. Winds light
Summit specific forecast
Mountain summit forecast map
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.
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 Yr Wyddfa (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 Yr Wyddfa's (Snowdon) 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.