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Mourne Mountains


High until Monday, lower for detail of the change to unsettled weather after that.

  • Saturday
  • Sunday
  • Further outlook

Saturday 24 March 2018

Weather hazards

Strong sunlight Medium likelihood Hide detail

Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Poor visibility Low likelihood Show detail

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.


Mainly dry with sunny spells. Slight chance of a few showers later, which would be wintry on the tops. Fairly light winds.

Weather at 700m

06:00 09:00 12:00 15:00 18:00 21:00
Clear night Sunny day Sunny intervals Sunny intervals Partly cloudy night Clear night
00% 00% <05% 20% 10% 00%
Chance of precipitation
600 600 700 800 800 700
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m N 21 29 NW 15 20 NW 10 14 W 11 17 W 14 19 NW 19 26
300m N 12 21 NW 7 12 NW 6 11 W 8 14 W 7 12 NW 10 17
Valley N 12 21 NW 6 12 NW 5 11 W 7 14 NW 6 14 NW 8 15

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m 1 2 3 4 3 2
300m 2 4 7 8 5 3
Valley 3 6 8 9 6 4

Feels like temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m -5 -3 -1 0 -2 -4
300m -2 2 5 5 3 0
Valley -1 3 7 7 4 1
Sunrise: 06:17   Sunset: 18:44
Moon phase: First quarter


Any mist or fog patches in the valleys quickly clearing through the morning with some sunny spells for much of the day. During the afternoon cloud will bubble up and may give the odd light shower which would be of snow if they drift over the peaks above 700m but it could well stay dry throughout. Cloud dissipating after dark to leave largely clear skies.

Chance of cloud-free mountain/hill tops at 700m

90%. Any mist and fog may lift up the valleys through the morning.


Generally very good. Any light showers later unlikely to be heavy enough to reduce visibility by much.

Meteorologist's view

Table values look reasonable though valley temperatures will be lower at dawn and again by midnight.

Sunday 25 March 2018

Sunrise: 07:15   Sunset: 19:46
Moon phase: First quarter


Another mainly dry and bright day with some sunny spells. The chance of one or two afternoon or early evening showers again which would be of snow on the hilltops.

Maximum wind speed expected

West to northwest 10-15mph.

Chance of cloud-free mountain/hill tops at 700m



  • At 700m Zero Celsius, rising to Plus 2 for a time in the afternoon.
  • Valley Minus 2 at dawn rising to Plus 9 in the afternoon and back down to near freezing by midnight.
  • Freezing level 700-800m


Very good, perhaps brief reductions to moderate in any showers.

Monday 26 March 2018

Sunrise: 07:13   Sunset: 19:48
Moon phase: First quarter

Most of the day dry and bright with some sunny spells. Cloud increasing towards evening, initially high cloud but some capping cloud developing later with heavy rain arriving during the evening, as cloud bases lower well down the hills. Light winds at first then a strengthening south to southeasterly by evening. Freezing level rising above the summits by the time the rain arrives.

Tuesday 27 March 2018

Sunrise: 07:10   Sunset: 19:50
Moon phase: Waxing gibbous

Rain clearing to occasional showers overnight. Low confidence on detail during the day, but probably cloudy and mainly dry until later then another spell of rain. Freezing level mainly above summits.

Wednesday 28 March 2018

Sunrise: 07:08   Sunset: 19:52
Moon phase: Waxing gibbous

Low confidence on any detail, but a colder day looks likely with northeasterly winds bringing a few showers which could be of snow on higher ground.

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