Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
Medium due to movement and position of a waving weather front during Monday.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Mountain weather forecast
Dry, bright start then turning cloudy with occasional rain arriving in afternoon.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
20% | 40% | 70% | 70% | 70% | 50% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
W
14
|
SW
15
|
SW
15
|
SW
10
|
SW
8
|
NW
8
|
| 600m |
SW
10
|
SW
12
|
SW
12
|
S
10
|
S
5
|
W
5
|
| 300m |
S
5
|
SW
7
|
SW
8
|
S
5
|
S
2
|
W
3
|
| Valley |
S
5
|
SW
7
|
SW
7
|
S
4
|
S
2
|
W
3
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m | 17 | 20 | 19 | 13 | 10 | 10 |
| 600m | 13 | 15 | 16 | 13 | 7 | 8 |
| 300m | 10 | 12 | 13 | 8 | 4 | 7 |
| Valley | 10 | 12 | 13 | 7 | 4 | 7 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
8°
|
8°
|
7°
|
7°
|
7°
|
7°
|
| 600m |
10°
|
10°
|
10°
|
9°
|
9°
|
9°
|
| 300m |
12°
|
12°
|
12°
|
11°
|
11°
|
10°
|
| Valley |
13°
|
14°
|
14°
|
12°
|
12°
|
12°
|
| Freezing Level |
1,900m
|
2,500m
|
2,800m
|
2,700m
|
2,600m
|
2,000m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
4°
|
4°
|
4°
|
4°
|
5°
|
4°
|
| 600m |
7°
|
7°
|
7°
|
7°
|
8°
|
8°
|
| 300m |
11°
|
11°
|
11°
|
10°
|
10°
|
10°
|
| Valley |
12°
|
12°
|
12°
|
12°
|
12°
|
11°
|
Additional weather information
Meteorologist's view
Some uncertainty in rain details due to slow moving, waving weather front.
Weather
Mainly dry start to Monday with areas of low cloud. Some early brightness before becoming cloudy during the morning with outbreaks of rain arriving in afternoon, some of the rain rather heavy and perhaps persistent.
Chance of cloud-free hill tops
70%, but 30% early and late in the day.
Low cloud and visibility
Occasional or patchy cloud, base 300 to 600m, mainly early and late in day. Visibility mostly good, but moderate in rain, and poor or very poor in cloud covering summits.
Ground conditions
Please see - https://snowdonia.gov.wales/visit/snowdon/yr-wyddfa-ground-conditions-reports/
Mountain weather information
Weather
Rather cloudy with patchy rain or showers overnight. Occasional summit cloud and showers during daylight hours with some drier and brighter spells.
Chance of cloud-free hill tops
60%
Maximum wind speed expected
West 30mph gusts 40mph.
Temperature
- At 800m Plus 4 degrees Celsius rising to plus 7 degrees Celsius.
- Valley Plus 8 degrees Celsius rising to plus 15 degrees Celsius
- Freezing level Above the summits.
Low cloud and visibility
Scattered to broken bases 600m, mainly in morning and in showers. Visibility good or very good, falling moderate or poor in showers and very poor in summit cloud.
Mountain weather information
Wed 4 Oct
Sunrise:
Sunset:
Rather cloudy skies with some brightness and scattered showers, with chance of longer spell of rain. Strong to gale force southwest winds at height.
Thu 5 Oct
Sunrise:
Sunset:
Bright start with further chance of showers. Cloud thickening to bring afternoon rain and drizzle, with possible wet conditions developing. Southwesterly winds reaching 35-40mph by evening.
Fri 6 Oct
Sunrise:
Sunset:
Probably turning drier and brighter, with cloud bases lifting. Strong southwest winds at height, reaching around 45mph across highest summits.
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.
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.