Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Thunderstorm
Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
Poor visibility
Very murky conditions, the mountains shrouded in fog, making navigation challenging. Map and compass essential.
Mild
Air temperature above freezing to highest summits. May feel pleasantly warm on lower ground, but take appropriate layers. Feeling chilly if exposed to wind.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Thunderstorm
Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
Poor visibility
Very murky conditions, the mountains shrouded in fog, making navigation challenging. Map and compass essential.
Mild
Air temperature above freezing to highest summits. May feel pleasantly warm on lower ground, but take appropriate layers. Feeling chilly if exposed to wind.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 22nd May 2024
Last updated
Tue 21st May 24 at
4:05PM
Summary for all mountain areas
Low pressure drifting in from the east will bring scattered thundery bursts of rain, developing into increasingly widespread rain, sustained heavy rain setting in for eastern Scotland and Pennines. Cloud filling in across most hills and winds generally strengthening.
Headline for Eryri / Snowdonia National Park
Rain heavy at times, risk thunder; wind increasing, feeling cool.
How windy? (On the summits)
Northerly, gradually strengthening from 15mph after dawn, to 30-40mph evening.
Effect of the wind on you?
As wind strengthens will increasingly impede ease of walking on higher areas and wind chill will become considerable.
How Wet?
Often raining, risk local thunder.
Bursts of heavy rain and possibly thunderstorms developing through morning. The rain widespread and persistent for periods.
Cloud on the hills?
Increasingly extensive
Considerable variation both through the day and sometimes between adjacent summits. Deteriorating where raining: quite widely cloud forming on lower slopes. However, even in morning, patches of fog from some lower slopes up.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Little or no sunshine. Hazy, and visibility deteriorating markedly where raining.
How Cold? (at 900m)
8C, but as wind strengthens feeling increasingly near to freezing.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 23rd May 2024
Last updated
Tue 21st May 24 at
4:05PM
How windy? (On the summits)
Northwesterly 25 to 40mph, gusts over 50mph around higher summits.
Effect of the wind on you?
Considerable wind chill and walking strenuous over higher terrain, in places difficult on exposed tops and ridges.
How Wet?
Rain much of the day
A broad swathe of rain from overnight into the daytime, fading slowly, but some heavy bursts on and off into afternoon.
Cloud on the hills?
Extensive low cloud
Cloud blanketing the mountains widely, only slowly lifting upslope, but covering most high terrain all day.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Mostly overcast and dull. Poor visibility in rain.
How Cold? (at 900m)
3 to 5C. Wind chill in stronger speeds feeling like -5 to -8C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 24th May 2024
Last updated
Tue 21st May 24 at
4:05PM
How windy? (On the summits)
Westerly 15 to 20mph.
Effect of the wind on you?
Fairly small
How Wet?
Local rain or showers clearing
Patchy rain drifting around slowly from dawn into the morning. Local showery bursts forming, these mostly moving away eastwards during afternoon.
Cloud on the hills?
Lifting and breaking
Banks of cloud around higher slopes in the morning generally lifting toward higher tops then above tops or breaking up during afternoon.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Fairly cloudy start, sun may increasingly develop from west and visibility becoming very good.
How Cold? (at 900m)
5 to 7C
Freezing Level
Above the summits
Planning Outlook
A slow-moving area of low pressure will leave areas of rain and showers later this week, plus varied banks of low cloud across the mountains, feeling cool. Improving at least temporarily into the weekend as pressure rises for a time, becoming warmer, but southerly winds will strengthen ahead of lowering pressure over the Atlantic, likely to move in by early next week to bring changeable conditions, rain at times, most frequent western Scotland.