Mountain weather

Mourne Mountains

Mourne Mountains Mountain weather forecast table

Confidence

High for cold, wintry conditions through the coming days but lower for distribution and timing of any showers.

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.

Mountain weather forecast

Mainly dry with sunny spells. Cold with occasionally strong northwesterly winds easing

06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 700m)
Partly cloudy (night) Sunny day Sunny day Cloudy Cloudy Partly cloudy (night)
Chance of precipitation
(at 700m)
20% <05% <05% 20% 20% 20%

Wind direction and speed (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m NW
18
N
15
NW
20
NW
19
NW
16
N
18
300m N
11
N
9
NW
12
N
11
N
10
N
10
Valley NW
9
N
7
N
11
N
10
NW
9
N
8
Wind gust (mph)
Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m 24 19 28 27 22 25
300m 18 15 21 21 17 18
Valley 17 14 20 20 17 17

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m
-1°
-2°
-3°
-2°
-3°
-2°
300m
-1°
-1°
Valley
Freezing Level
400m
200m
200m
200m
200m
200m

Altitude above mean sea level
06:00 09:00 12:00 15:00 18:00 21:00
600m
-8°
-8°
-10°
-9°
-9°
-9°
300m
-4°
-4°
-5°
-5°
-6°
-5°
Valley
-3°
-3°
-3°
-3°
-4°
-4°

Additional weather information

Meteorologist's view

Minimum temperatures around minus 2 or 3 Celsius at dawn. Frozen surfaces likely at all but the lowest levels through the day.

Weather

A few wintry showers through the early hours with some clear spells around. Then mainly dry through the morning and early afternoon with some good spells of sunshine developing. From mid-afternoon there is an increasing risk of a few mainly light snow showers.

Chance of cloud-free hill tops

Close to 100% through the morning becoming nearer 60% through the afternoon

Low cloud and visibility

Little or no cloud expected below the summits through the morning then occasional or periods of cloud above about 600m developing through the afternoon. Away from cloud visibility generally very good, perhaps falling briefly to a kilometre or so in snow showers.

Sunrise:
Sunset:

Mountain weather information

Weather

Mainly dry with clear spells overnight. Then another cold but bright day with sunny spells and just a few snow showers, these dying out later.

Chance of cloud-free hill tops

Around 75%

Maximum wind speed expected

Northwesterly 15-20mph gradually backing westerly 10-15mph

Temperature

  • At 700m Minus 5 Celsius rising briefly to minus 2 Celsius by day
  • Valley Minus 3 or 4 Celsius at dawn rising to 2 or 3 Celsius by day
  • Freezing level Frozen surfaces likely at all but the lowest levels through the day.

Low cloud and visibility

Occasional cloud above about 600m, otherwise visibility very good, perhaps falling to a kilometre or so briefly in snow showers

Mountain weather information

Sat 10 Dec

Sunrise:
Sunset:

Cold with bright or sunny spells, risk of occasional snow showers around the middle of the day. Mainly light northwesterly winds. Frozen surfaces likely at all but the lowest levels through the day.

Sun 11 Dec

Sunrise:
Sunset:

Mainly dry with some long spells of sunshine but remaining cold. Light northwesterly winds. Frozen surfaces likely at all but the lowest levels through the day.

Mon 12 Dec

Sunrise:
Sunset:

Another cold but mainly dry day. Freshening easterly winds with freezing levels rising to around 300m.

Updated at:

Summit specific forecast

Mountain summit forecast map

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The Mourne Mountains include the highest mountains in Northern Ireland; the highest of these is Slieve Donard standing at 850 metres at the northeastern edge of the Mournes, overlooking Newcastle and Dundrum Bay. At the summit of Slieve Donard there is a cairn and a small stone tower, which is part of the Mourne Wall, which passes over the mountain’s southern and western shoulders.

The Mourne Wall is a 35 kilometre dry stone wall that crosses fifteen summits, constructed between 1904 and 1922 by the Belfast Water Commissioners to define and enclose the catchment area for the newly constructed Silent Valley Reservoir.v