
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for a return to milder, unsettled conditions from mid-week. Medium in details.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Poor Visibility
Blizzards
Heavy Persistent Snow
Heavy Persistent Rain
Mountain weather forecast
Rain and snow dying out. Perhaps some brighter spells developing later. Severe wind chill over the summits.
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
80% | 80% | 40% | 20% | 10% | <05% |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
NE
23
|
NE
21
|
NE
20
|
E
13
|
E
10
|
E
10
|
600m |
NE
13
|
NE
13
|
NE
13
|
E
8
|
E
8
|
E
9
|
300m |
NE
9
|
NE
9
|
NE
9
|
E
5
|
E
5
|
E
7
|
Valley |
NE
9
|
NE
9
|
NE
9
|
E
5
|
E
5
|
SE
7
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m | 27 | 26 | 25 | 17 | 14 | 14 |
600m | 17 | 18 | 18 | 12 | 13 | 12 |
300m | 17 | 17 | 16 | 10 | 12 | 13 |
Valley | 17 | 17 | 16 | 11 | 12 | 13 |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
-1°
|
-1°
|
0°
|
0°
|
-1°
|
-1°
|
600m |
1°
|
1°
|
2°
|
2°
|
1°
|
1°
|
300m |
3°
|
4°
|
4°
|
4°
|
3°
|
2°
|
Valley |
4°
|
5°
|
6°
|
6°
|
4°
|
3°
|
Freezing Level |
700m
|
900m
|
900m
|
800m
|
800m
|
700m
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
900m |
-9°
|
-8°
|
-6°
|
-6°
|
-6°
|
-6°
|
600m |
-4°
|
-4°
|
-3°
|
-2°
|
-2°
|
-3°
|
300m |
0°
|
0°
|
1°
|
2°
|
0°
|
0°
|
Valley |
1°
|
2°
|
3°
|
4°
|
2°
|
1°
|
Additional weather information
Meteorologist's view
Continuation of winter hazards at height, although snow dying out and winds gradually easing.
Weather
Outbreaks of rain and snow during the morning, snow mainly above 600m with temporary blizzard conditions and drifting over the summits. The rain and snow dying out late morning or early afternoon. Remaining mostly cloudy, although some brighter spells are possible in the afternoon, mainly in the west. Partly cloudy in the evening with a frost developing.
Chance of cloud-free hill tops
20% in the morning rising to 60% in the afternoon.
Low cloud and visibility
Extensive cloud, base around 300-600m in the morning. The cloud lifting and breaking a little in the afternoon to become occasional with base around 500-700m in the afternoon. Visibility moderate to very poor in early rain, snow and cloud, becoming occasionally good in the afternoon.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
Patchy freezing fog possible in the valleys overnight, otherwise partly cloudy with a frost likely. Dry with some early brightness, but cloud tending to thicken and lower during the day along with strengthening south or southeast winds giving severe wind chill. Outbreaks of heavy rain and snow in the evening. Snow initially above 600m, temporary blizzard conditions possible, but turning to rain at all or most levels by midnight.
Chance of cloud-free hill tops
60% during daylight hours, decreasing 10% from late afternoon.
Maximum wind speed expected
Southeast 15mph, increasing to 35-40mph gusts 55mph.
Temperature
- At 800m Minus 1 Celsius, later Plus 2 Celsius
- Valley Minus 2 Celsius rising to plus 4 Celsius
- Freezing level All levels at first, gradually rising near or above the summits.
Low cloud and visibility
Occasional cloud, base 400-600m overnight, perhaps lifting and breaking briefly around the middle of the day. Cloud becoming extensive, base 300 to 600m from late afternoon. Visibility occasionally good, but moderate in rain and very poor in cloud and in hill snow during the evening.
Mountain weather information
Thu 7 Dec
Cloudy and overcast with outbreaks of rain, heavy and persistent at times. South or southeast gales to perhaps storm force winds at height. Freezing level above the summits.
Fri 8 Dec
Mostly cloudy with showers or longer outbreaks of rain, heavy at times. Strong to gale force southerly winds at height. Freezing level above the summits.
Sat 9 Dec
Cloudy with showers or longer outbreaks of rain, heavy at times. Strong to gale force south or southwest winds at height. Freezing level above the summits.
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.