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Mourne Mountains


High for general developments. Moderate for chance of showers and cloud breaks on Friday and over the weekend.

  • Wednesday
  • Thursday
  • Further outlook

Wednesday 21 November 2018

Weather hazards

Gales High likelihood Hide detail

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.

Heavy snow Medium likelihood Show detail

Heavy snow can lead to rapid changes in underfoot conditions and paths may become treacherous or hidden. It also brings very poor visibility and often makes navigation much more challenging. When deep snow accumulates progress is often time consuming and strenuous, significantly affecting the distance one can travel on foot. Deep drifts can develop if snow is combined with strong winds. A heightened avalanche risk is possible and avalanche reports should be consulted where available.

Severe chill effect Medium likelihood Show detail

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.

Poor visibility Medium 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.

Heavy persistent rain Medium 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.

Blizzards Low likelihood Show detail

Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.

Thunderstorms Low likelihood Show detail

Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.


Cold and windy with rain and hill snow.

Weather at 700m

06:00 09:00 12:00 15:00 18:00 21:00
Sleet shower Heavy snow Heavy snow Light snow Hail shower night Light snow shower night
90% 90% 80% 80% 80% 40%
Chance of precipitation
800 700 700 700 800 800
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 NE 34 47 E 29 41 SE 30 42 SE 29 40 SE 31 43 SE 28 38
300m NE 19 33 E 17 30 SE 18 32 SE 17 29 SE 18 31 SE 16 28
Valley NE 16 32 E 13 27 SE 15 31 SE 14 29 SE 15 31 SE 14 28

Temperature (°C) By altitude above mean sea level

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

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

06:00 09:00 12:00 15:00 18:00 21:00
600m -7 -7 -7 -7 -6 -5
300m -2 -3 -2 -2 -1 -1
Valley 0 0 0 0 1 1
Sunrise: 08:03   Sunset: 16:16
Moon phase: Waxing gibbous


A cloudy day with showers or longer spells of rain, some heavy. Snow is expected on the hilltops, initially above 800m but falling to 500m. Blizzard conditions are possible on the summits. The showers becoming less frequent in the evening.

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

20%, frequent spells of cloud above 500-700m, lowest in passing showers. Improving to 70% in the evening with cloud more patchy, mainly above 600-700m.


Moderate to poor in rain and very poor in snow.

Meteorologist's view

Strong winds across summits with a notable wind chill, further enhanced in rain, sleet and wet snow.

Thursday 22 November 2018

Sunrise: 08:04   Sunset: 16:15
Moon phase: Full


Dry but cloudy through the early hours. Cloud soon clears to give a dry sunny morning. Increasingly cloudy in the afternoon, a few showers in the evening, sleet or wet snow over the highest summits.

Maximum wind speed expected

Southeast 25 mph, gusting 35 mph, becoming east 20 gusting 25-30 mph in the afternoon.

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

100% in the morning, any cloud above the summits. Becoming 60% in the afternoon, occasional cloud above 600m.


  • At 700m Plus 2 Celsius
  • Valley 4 Celsius rising to plus 8 Celsius
  • Freezing level Above the summits.


Very good or excellent, occasionally poor in low cloud during the afternoon.

Friday 23 November 2018

Sunrise: 08:06   Sunset: 16:14
Moon phase: Full

A cloudy start, perhaps a few showers. Turning drier and brighter through the day. Moderate easterly winds. Freezing level above the summits.

Saturday 24 November 2018

Sunrise: 08:08   Sunset: 16:12
Moon phase: Full

Generally cloudy. Showers becoming increasingly likely through the day. Moderate easterly winds, perhaps turning light later. Freezing level above the summits.

Sunday 25 November 2018

Sunrise: 08:10   Sunset: 16:11
Moon phase: Waning gibbous

A few showers possible, but a mostly dry day is expected with some bright or sunny spells. Light to moderate northeast winds. Freezing level just above the summits.

Issued at:
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