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Mourne Mountains


High for a much poorer climbing day on Friday and a better day on Saturday. Low for all details early next week.

  • Friday
  • Saturday
  • Further outlook

Friday 20 July 2018

Weather hazards

Poor visibility High likelihood Hide 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.

Heavy persistent rain Low likelihood Show detail

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.

Strong sunlight Low likelihood Show 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.


Cloudy with outbreaks of rain, some heavy at first then becoming more patchy and drizzly in the afternoon then dying out in the evening. Hill fog.

Weather at 700m

06:00 09:00 12:00 15:00 18:00 21:00
Heavy rain Light rain Light rain Cloudy Cloudy Sunny intervals
90% 70% 50% 30% 10% 10%
Chance of precipitation
3,300 3,300 3,200 3,000 2,600 2,200
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 SW 18 23 SW 15 19 W 14 19 NW 14 19 N 16 21 N 17 23
300m SW 9 13 SW 9 13 W 9 14 NW 9 14 N 10 17 N 11 18
Valley SW 6 12 SW 6 12 W 7 13 NW 8 14 N 9 16 N 10 17

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m 11 12 13 13 12 11
300m 12 13 15 15 15 13
Valley 13 14 16 16 16 14

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

06:00 09:00 12:00 15:00 18:00 21:00
600m 7 9 10 10 10 7
300m 11 12 14 14 13 11
Valley 12 13 15 15 15 12
Sunrise: 05:17   Sunset: 21:43
Moon phase: First quarter


Persistent and occasionally heavy rain at first will then ease off through the morning but some lighter outbreaks will continue on and off into the afternoon, then becoming dry in the evening with perhaps some late sunshine.

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

Around 10% with widespread cloud 300-600m, increasing 20-30% later in the afternoon and 60% in the evening with cloud breaking and perhaps lifting to near summit level.


Moderate, occasionally poor in rain and drizzle, improving good at times in drier spells in the afternoon and evening away from cloud.

Meteorologist's view

Note the change in wind direction through the day

Saturday 21 July 2018

Sunrise: 05:18   Sunset: 21:41
Moon phase: First quarter


A cloudy start but soon brightening up from the west with some sunny intervals. Some thicker cloud and light rain or drizzle will return from the west towards late evening.

Maximum wind speed expected

Northwesterly 15mph.

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

40% at first with some 600m cloud then rising 90% with bases breaking and lifting, Falling 60% towards late evening as the cloud thickens from the west.


  • At 700m Plus 12 Celsius rising to Plus 15 in the afternoon.
  • Valley No lower than 13 Celsius overnight, rising to 21 Celsius in the afternoon sunshine.
  • Freezing level Above summits.


Moderate at first becoming very good during the morning.

Sunday 22 July 2018

Sunrise: 05:20   Sunset: 21:40
Moon phase: First quarter

Early low cloud lifting to some sunny spells. Moderate westerly breeze. Very warm and humid.

Monday 23 July 2018

Sunrise: 05:21   Sunset: 21:39
Moon phase: Waxing gibbous

Another dry bright and warm day, though there is a chance of a band of rain spreading from the north later.

Tuesday 24 July 2018

Sunrise: 05:23   Sunset: 21:37
Moon phase: Waxing gibbous

Overnight rain clearing to bright or sunny spells and a few showers. Fresh southwesterly winds.

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