Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature near or just above freezing on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature near or just above freezing on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 21st January 2025
Last updated
Mon 20th Jan 25 at
4:00PM
Summary for all mountain areas
Below freezing on Scottish tops. Noticeably chilly in the breeze. A cluster of showers with hill snow moves across the Highlands early in the day, but clears to be often dry and bright. Showers continue near to western coasts, some moving inland. A slow-moving front over England & north Wales brings grey and damp conditions.
Headline for Eryri / Snowdonia National Park
Rain much of the day, low cloud. Moderate breeze.
How windy? (On the summits)
Southwesterly 15 to 25mph.
Effect of the wind on you?
Starting to affect comfortable walking on higher exposed terrain, impacting balance on some ridges. Marked wind chill.
How Wet?
Rain and drizzle persistent, sleet tops
Often raining for much of the region, periods of steadier rain over western hills, at times turning drizzly. Some sleet or wet snow on higher terrain above about 800m. Least amounts further east.
Cloud on the hills?
Extensive
Blanket low cloud across the mountains all day. Lowest bases toward western coasts from 300-400m upward. Inland base may be a little higher, local breaks to 600m or higher on eastern Carneddau area.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull. Hazy, poor visibility in rain.
How Cold? (at 900m)
1 or 2C. Wind chill feeling like -7C.
Freezing Level
Just above highest summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 22nd January 2025
Last updated
Mon 20th Jan 25 at
4:00PM
How windy? (On the summits)
Variable direction, 10mph and lower.
Effect of the wind on you?
Little to none
How Wet?
Early rains soon clear, then mostly dry
Patches of rain possible in most places early morning, though not extensive. Falling as sleet or snow on highest terrain. Mostly dry later, possibility of light showers on hills nearest coasts.
Cloud on the hills?
High terrain covered, moments of clearing
Highest tops often capped, bases occasionally reaching further down on windward slopes. Intermittent clearing as well.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Glimpses of sun possible, though possibly blocked by high cloud. Good visibility out of cloud; hazier toward east Wales.
How Cold? (at 900m)
Around 0C
Freezing Level
900m
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 23rd January 2025
Last updated
Mon 20th Jan 25 at
4:00PM
How windy? (On the summits)
Southerly turning west-southwesterly; speeds soon increasing 30 to 45mph, risk 60-70mph for a time, suddenly squally.
Effect of the wind on you?
Soon arduous or difficult conditions, frequent buffeting where exposed; gusts may knock you over. Significant wind chill.
How Wet?
Heavy rain, some snow highest tops
Soon from dawn, abruptly heavy rain, sleet or at times snow above 800m. Continuing for several hours, then breaking up into clusters of showers into afternoon, but may still result in frequent precipitation. Chance isolated thunder.
Cloud on the hills?
Varied low cloud, highest north
Varied patches at first, but cloud at dawn may be mostly above hills. Lowering extensively in rain, most persistent southwest from Snowdon/Yr Wyddfa group. Higher bases Carneddau.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Generally overcast. Visibility very poor in rain, locally better at times in north.
How Cold? (at 900m)
0 or 1C. Wind chill feeling like -10 to -15C.
Freezing Level
900m or above.
Planning Outlook
Deteriorating later this week - a series of storm systems coming in from the Atlantic through late January bringing frequently severe conditions to the mountains. Thursday sees winds reach gale force on many tops with a spell of heavy rain and upland snow developing from the west. By Friday, severe conditions from lower elevations upward, hurricane-force winds over the mountains, plus extensive rain and hill snow. Gales continue into Saturday, severe for the Highlands. Snow is likely to accumulate over Scottish mountains during the next week or so with only brief thawing. More variable temperatures for England and Wales with cycles of freeze and thaw. Atlantic patterns likely prevail into early February.