Mountain weather
Snowdonia Mountain weather forecast table
Confidence
High for dry and fine weather.
This evening forecast
A quiet night, with clear skies to begin. High level cloud will arrive from the northwest later but the peaks will be clear and it will stay dry.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
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
Another warm and sunny day, with 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) |
00% | 00% | 00% | 00% | 00% | 00% | 00% | 00% |
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 |
SE
12
|
S
15
|
S
12
|
S
15
|
S
16
|
SW
18
|
SW
22
|
S
22
|
| 600m |
SE
10
|
SE
10
|
SE
10
|
S
12
|
S
15
|
SW
15
|
S
15
|
S
15
|
| 300m |
SE
6
|
SE
8
|
SE
6
|
S
8
|
S
10
|
SW
12
|
S
10
|
S
8
|
| Valley |
S
6
|
S
8
|
S
5
|
S
5
|
SW
10
|
SW
10
|
S
8
|
S
10
|
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 | 15 | 18 | 15 | 20 | 22 | 25 | 30 | 30 |
| 600m | 15 | 15 | 15 | 18 | 22 | 25 | 20 | 22 |
| 300m | 12 | 12 | 12 | 15 | 18 | 20 | 18 | 15 |
| Valley | 12 | 12 | 10 | 12 | 18 | 18 | 15 | 15 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
12°
|
12°
|
11°
|
11°
|
11°
|
12°
|
11°
|
10°
|
| 600m |
13°
|
13°
|
13°
|
13°
|
14°
|
14°
|
13°
|
11°
|
| 300m |
14°
|
13°
|
13°
|
16°
|
17°
|
17°
|
15°
|
12°
|
| Valley |
14°
|
13°
|
13°
|
17°
|
20°
|
22°
|
19°
|
13°
|
| Freezing Level |
2,300m
|
2,000m
|
2,000m
|
1,800m
|
1,600m
|
1,600m
|
1,600m
|
1,600m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 900m |
11°
|
9°
|
9°
|
8°
|
8°
|
8°
|
7°
|
6°
|
| 600m |
12°
|
10°
|
10°
|
11°
|
11°
|
11°
|
10°
|
8°
|
| 300m |
13°
|
11°
|
11°
|
14°
|
15°
|
15°
|
13°
|
10°
|
| Valley |
13°
|
12°
|
12°
|
15°
|
18°
|
20°
|
16°
|
11°
|
Additional weather information
Weather
It will be a dry start to the day, with light winds. There will be some high level cloud first thing and early haze is possible but this will soon clear to give a sunny day with clear blue skies developing. UV levels will be high, therefore sunburn is possible on exposed skin. Tree pollen levels will also be high.
Chance of cloud-free mountain/hill tops at 800m
100% through the day.
Ground conditions
For archived reports see - http://www.snowdonia.gov.wales/visiting/walking/ground-conditions
Visibility
Nearby peaks may be hazy first thing but once the sun comes up, visibilities will be very good. Nearby peaks will be clearly visible, with good detailing.
Meteorologist's view
Into the afternoon it will become breezier above 600m.
Mountain weather information
Weather
A similar sunny day with blue skies. Feeling very warm at lower levels, but the wind will be stronger over the peaks. UV levels will be high, therefore sunburn is possible on exposed skin. Tree pollen levels will also be high. Some high level cloud will build during the afternoon but the peaks will stay clear.
Chance of cloud-free mountain/hill tops at 800m
100% throughout.
Maximum wind speed expected
Southeasterly 20 mph gusting 30 mph at surface, easing later. Southeasterly 25 mph gust 35-40 mph over the peaks, easing from midday.
Temperature
- At 800m Positive 06 Celsius rising to Positive 12 Celsius.
- Valley Positive 04 Celsius rising to Positive 23 Celsius.
- Freezing level 2000-2500m.
Visibility
Nearby peaks may be hazy first thing but once the sun comes up, visibilities will be very good. Nearby peaks will be clearly visible, with good detailing.
Mountain weather information
Tuesday 23 April
Sunrise:
Sunset:
Another fine, dry and very warm day. Clear blue skies are likely through the daylight hours however strong winds are possible over the peaks by the evening. High UV and pollen levels.
Wednesday 24 April
Sunrise:
Sunset:
After a dry start, thunderstorms are possible into the afternoon and evening. Gales are likely over the peaks later.
Thursday 25 April
Sunrise:
Sunset:
An unsettled day with strong winds and showers. Risk of thunderstorms and hail.
Updated at:
Summit specific forecast map
Summit specific forecasts for SnowdoniaThe 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.