
Eryri / Snowdonia Mountain weather forecast table
Confidence
Good confidence for an unsettled day on Tuesday, with heavy rain and showers, lower for rainfall accumulations and extent of thunder risk.
This evening forecast
Isolated showers linger over southern parts of the park, with some decent sunny spells heading into the evening, gradually becoming cloudier from the west. Breezy.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Poor Visibility
Thunderstorms
Heavy Persistent Rain
Storm Force Winds
Mountain weather forecast
Cloudy with heavy rain, quickly followed by heavy showers and a risk of thunder. Strong to gale-force winds on exposed summits.
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 800m) |
60% | 60% | 80% | 90% | >95% | 80% | 80% | 20% |
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
900m |
SW
36
|
SW
38
|
SW
42
|
SW
43
|
SW
39
|
SW
34
|
W
32
|
W
32
|
600m |
SW
24
|
SW
27
|
SW
31
|
SW
32
|
SW
29
|
SW
26
|
W
22
|
W
21
|
300m |
SW
15
|
SW
17
|
SW
20
|
SW
20
|
SW
20
|
SW
18
|
W
16
|
W
14
|
Valley |
SW
15
|
S
17
|
SW
20
|
SW
20
|
SW
20
|
SW
17
|
W
16
|
W
15
|
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
900m | 44 | 47 | 53 | 55 | 51 | 45 | 42 | 40 |
600m | 32 | 36 | 41 | 43 | 40 | 36 | 31 | 28 |
300m | 28 | 30 | 36 | 37 | 35 | 31 | 28 | 26 |
Valley | 27 | 29 | 35 | 35 | 34 | 29 | 28 | 26 |
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
900m |
8°
|
8°
|
9°
|
9°
|
9°
|
10°
|
10°
|
9°
|
600m |
10°
|
10°
|
11°
|
11°
|
11°
|
12°
|
12°
|
11°
|
300m |
13°
|
12°
|
13°
|
13°
|
13°
|
14°
|
14°
|
13°
|
Valley |
14°
|
14°
|
14°
|
14°
|
15°
|
16°
|
16°
|
15°
|
Freezing Level |
2,000m
|
2,200m
|
2,400m
|
2,400m
|
2,300m
|
2,300m
|
2,300m
|
2,400m
|
Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
---|---|---|---|---|---|---|---|---|
900m |
2°
|
2°
|
3°
|
3°
|
4°
|
5°
|
5°
|
4°
|
600m |
6°
|
6°
|
6°
|
6°
|
7°
|
8°
|
8°
|
8°
|
300m |
10°
|
10°
|
9°
|
10°
|
10°
|
11°
|
12°
|
11°
|
Valley |
11°
|
11°
|
11°
|
11°
|
11°
|
13°
|
13°
|
12°
|
Additional weather information
Meteorologist's view
A tough day in the hills, with gusts reaching 60mph creating hazardous walking conditions and a real risk of being knocked off balance. Navigation may prove difficult, as strong winds combine with low cloud, heavy rain, and the potential for thunder and hail, making it easy for walkers to become disoriented.
Weather
A band of cloud and persistent heavy rain spreads over the park during the morning, driven horizontally by the gale force winds. This will be shortly followed by frequent showers, often heavy with a risk of thunder and possibly some large hail.
Chance of cloud-free hill tops
Less than 10% throughout.
Low cloud and visibility
Overcast cloud is expected during the morning with bases obscuring hills above 100-200m. Visibility is expected to be poor or very poor in cloud and in any heavy downpours. Come the afternoon, there may be a few more breaks in the cloud cover, with bases expected to rise a touch, to around 300-400m. Although this may fall again in heavy showers.
Ground conditions
Please see - https://yrwyddfa.live/
Mountain weather information
Weather
A cloudy start to the day across the park, although remaining dry. Cloud will gradually begin to break up through the afternoon to see some decent sunny spells. Further cloud and rain will build in from the southwest by the evening.
Chance of cloud-free hill tops
30% becoming 80% by the afternoon.
Maximum wind speed expected
Westerly winds 15mph gusting up to 25mph on summits.
Temperature
- At 800m Plus 07 Celsius becoming Plus 12 Celsius.
- Valley Plus 14 Celsius becoming Plus 21 Celsius.
- Freezing level Well above summits.
Low cloud and visibility
Scattered to broken cloud across the park during the morning, with bases obscuring hills above 500-600m. By the afternoon, cloud will lift and break, with few amounts, well above summits. Sunshine, will turn hazy towards the end of the day, as cloud builds into the evening. Visibilities generally very good, with clear views of distant hills.
Mountain weather information
Thu 17 Jul
Often cloudy, with some brighter spells possible. Isolated showers, perhaps heavy at times. Fresh to strong south-southwesterly winds.
Fri 18 Jul
A cloudy start, with sunny spells developing, slight isolated showers possible. Moderate southwesterly winds.
Sat 19 Jul
Sunny spells and showers. Fresh southwesterly winds.
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.