Mountain weather

Eryri / Snowdonia

Eryri / Snowdonia Mountain weather forecast table

Confidence

High for remaining unsettled and turning colder towards the weekend but, due to low pressure becoming slow moving over the UK, becoming increasingly lower for details, especially with regard to winds and any longer spells of rain, sleet or snow.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
hazard 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.
hazard Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

hazard Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

Mountain weather forecast

Dry start then occasionally heavy rain. Summit gales.

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Cloudy Light rain Heavy rain Heavy rain Heavy rain Heavy rain
Chance of precipitation
(at 800m)
<05% 30% 80% 80% 80% 80%

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m SW
28
S
35
S
40
SW
34
SW
37
SW
43
600m S
22
S
26
S
26
S
23
SW
24
SW
29
300m S
14
S
19
S
19
S
16
SW
16
SW
19
Valley S
14
S
19
S
21
S
16
SW
16
SW
18
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m 34 43 49 43 47 55
600m 28 35 35 31 34 40
300m 25 32 33 29 30 35
Valley 24 33 36 30 30 33

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
Valley
10°
10°
Freezing Level
900m
2,200m
2,200m
2,400m
2,200m
2,300m

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
900m
-6°
-6°
-4°
-2°
-1°
-2°
600m
-3°
-4°
-2°
300m
Valley

Additional weather information

Meteorologist's view

Gusts around 60mph over ridges and summits from mid-morning producing, combined with the rain, a significant chill effect despite the rising temperatures.

Weather

A mainly dry but cloudy start, however outbreaks of rain, preceded above about 750m by snow spread east through the morning and become heavy at times, especially on western hills. The afternoon and through the evening sees further outbreaks of occasionally heavy rain, most persistent in the west with some far eastern hills seeing lighter, much patchier rain.

Chance of cloud-free hill tops

Around 75% at first falling close to zero by late morning.

Low cloud and visibility

Occasional cloud above about 750m at first becoming periods or persistent cloud above 450-600m, with patches below, by midday, although cloud in the east more occasional above 750m at times. Away from cloud visibility very good falling to several kilometres in rain and perhaps a kilometre in any snow.

Ground conditions

Please see - https://yrwyddfa.live/

Sunrise:
Sunset:

Mountain weather information

Weather

Cloud and occasionally heavy rain through the early hours clearing east around or soon after dawn to leave a bright day with some sunny spells and occasional showers developing, these falling increasingly as snow above about 450m.

Chance of cloud-free hill tops

Close to zero at dawn soon rising to 75%

Maximum wind speed expected

Southwesterly 30-40mph, gusts around 60mph over ridges and summits through the early hours but easing 20-25mph by mid-morning but still with gusts 40mph over higher ridges and summits.

Temperature

  • At 800m Around plus 5 Celsius falling to minus 1 Celsius
  • Valley Around plus 7 or 8 Celsius rising to around plus 9 Celsius
  • Freezing level Well above the summits gradually falling to 600m

Low cloud and visibility

Periods of cloud 450-600m, with patches below, lifting and breaking to become occasional above 750m, but lowering briefly in or near showers. Away from cloud visibility several kilometres in overnight rain, otherwise very good falling briefly to a kilometre or so in snow showers.

Mountain weather information

Fri 1 Mar

Sunrise:
Sunset:

Occasionally heavy morning rain and, above about 600m, snow clearing to leave sunny spells and snow showers in the afternoon. Strong southerly winds easing. Freezing level 600m rising to 900m for a time.

Sat 2 Mar

Sunrise:
Sunset:

Clear or sunny spells and snow showers, with rain or sleet below about 450m, perhaps merging into some longer spells of sleet or snow. Mainly light and variable winds. Freezing level around 600m.

Sun 3 Mar

Sunrise:
Sunset:

Rather cold with showers, falling mainly as snow away from lower slopes, once again risk of some longer spells of sleet or snow. Winds remaining mainly light and variable. Freezing level 450-600m

Updated at:

Summit specific forecast

Mountain summit forecast map

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