Mountain weather
Eryri / Snowdonia Mountain weather forecast table
Confidence
High for overall settled conditions with prolonged sunshine by day. Moderate for exact timing of cloud clearance each morning. Low confidence in the timing and distribution of showers over the weekend.
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
Early cloud clearing once again to widespread sunshine.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | <05% | 00% | 00% | 00% | 00% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
E
18
|
E
18
|
E
17
|
E
18
|
E
19
|
E
22
|
| 600m |
E
16
|
E
16
|
E
13
|
E
13
|
E
13
|
E
14
|
| 300m |
E
13
|
E
13
|
E
11
|
E
11
|
E
10
|
E
11
|
| Valley |
E
13
|
E
13
|
E
11
|
E
11
|
E
10
|
E
11
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m | 24 | 23 | 22 | 23 | 25 | 31 |
| 600m | 22 | 21 | 18 | 18 | 21 | 25 |
| 300m | 21 | 19 | 17 | 18 | 19 | 23 |
| Valley | 21 | 19 | 18 | 18 | 18 | 23 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
2°
|
5°
|
9°
|
11°
|
12°
|
9°
|
| 600m |
6°
|
8°
|
12°
|
14°
|
14°
|
12°
|
| 300m |
8°
|
12°
|
15°
|
17°
|
17°
|
14°
|
| Valley |
9°
|
13°
|
16°
|
18°
|
18°
|
14°
|
| Freezing Level |
2,000m
|
1,900m
|
1,900m
|
1,900m
|
2,000m
|
2,000m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 900m |
-3°
|
0°
|
5°
|
8°
|
8°
|
6°
|
| 600m |
2°
|
5°
|
9°
|
11°
|
12°
|
9°
|
| 300m |
5°
|
9°
|
13°
|
15°
|
15°
|
12°
|
| Valley |
6°
|
10°
|
14°
|
16°
|
16°
|
12°
|
Additional weather information
Meteorologist's view
High UV levels likely, with sun protection essential. Care should also be taken if heading out onto the hills early, with temperatures at height feeling cold in the fresh easterly winds, adequate layers recommended.
Weather
A cloudy start to the day but the cloud will soon thin and break, followed by periods of sunshine developing by mid-morning. Warm and dry with lots of very strong sunshine during the afternoon. Holding onto clear skies for the first part of the night, with some late evening sunshine but low cloud likely to return from the east later overnight.
Chance of cloud-free hill tops
40% in the east of the park to start, 80% in the west. Becoming 95% for all parts into the afternoon.
Low cloud and visibility
Generally good but mediocre or poor in cloud, with bases as low as 600-700m, covering tops in the east of the park around dawn. Visibility soon becoming very good all around, with good panoramic views, including at height.
Ground conditions
Please see - https://snowdonia.gov.wales/visit/snowdon/yr-wyddfa-ground-conditions-reports/
Mountain weather information
Weather
Staying dry, with again some early cloud in the east clearing and breaking to give widespread sunshine into the afternoon, tempered by a fresh easterly breeze.
Chance of cloud-free hill tops
60% in the east to start, becoming 95% for all into the afternoon.
Maximum wind speed expected
Easterly 15-20mph gusting 25-30mph.
Temperature
- At 800m 5 deg C becoming 13 deg C.
- Valley 8 deg C becoming 20 deg C.
- Freezing level Above summits.
Low cloud and visibility
Cloud bases of around 600-700m once again covering some higher tops in the east of the park to start. Cloud increasingly breaking through the morning to leave largely clear skies by the afternoon. Visibility generally good outside of any early cloud at height.
Mountain weather information
Fri 9 Jun
Sunrise:
Sunset:
Similar to previous days, with patchy overnight cloud soon clearing to leave another dry sunny day. Brisk easterly winds persisting.
Sat 10 Jun
Sunrise:
Sunset:
A dry start likely but forecast confidence lowers as conditions turn more unsettled into the afternoon, with an increasing risk of some heavy and thundery showers. Becoming warmer with winds easing.
Sun 11 Jun
Sunrise:
Sunset:
Forecast confidence remains lower but a generally cloudier day likely with a risk of showers. Staying warm with light winds.
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.