Mountain weather
Southwest Highlands Mountain weather forecast table
Confidence
High for a generally wet and windy weekend, but low for chance of any drier spells. High for general forecast to start next week, but some uncertainty in timings of rain bands and wind strength.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Storm Force Winds
Storm force winds (gusts over 70mph) make walking very strenuous with any mobility virtually impossible over exposed ground. Where these conditions occur there is a high risk of being blown over and even standing may be impossible at times with a risk of being blown off one’s feet. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.
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.
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.
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.
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.
Mountain weather forecast
Dry bright start, but rain spreading east. Severe gales increasing to storm force winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 800m) |
|
|
|
|
|
|
Chance of precipitation (at 800m) |
10% | <05% | 40% | >95% | >95% | >95% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 1300m |
S
43
|
S
54
|
S
66
|
S
70
|
S
70
|
SW
62
|
| 900m |
SW
31
|
S
37
|
S
43
|
S
44
|
SW
45
|
SW
41
|
| 600m |
S
45
|
S
53
|
S
58
|
S
61
|
SW
62
|
SW
54
|
| 300m |
S
21
|
S
24
|
S
28
|
S
30
|
S
30
|
S
28
|
| Glen |
SW
13
|
SW
15
|
S
19
|
S
21
|
S
23
|
SW
19
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 1300m | 52 | 65 | 81 | 85 | 85 | 76 |
| 900m | 40 | 48 | 56 | 58 | 59 | 54 |
| 600m | 53 | 63 | 70 | 74 | 76 | 67 |
| 300m | 32 | 34 | 39 | 44 | 45 | 42 |
| Glen | 27 | 31 | 38 | 43 | 45 | 39 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 1300m |
-2°
|
-2°
|
-1°
|
0°
|
2°
|
3°
|
| 900m |
1°
|
1°
|
1°
|
3°
|
4°
|
5°
|
| 600m |
3°
|
4°
|
4°
|
5°
|
6°
|
7°
|
| 300m |
5°
|
6°
|
6°
|
7°
|
8°
|
9°
|
| Glen |
7°
|
7°
|
8°
|
9°
|
10°
|
10°
|
| Freezing Level |
1,000m
|
1,100m
|
1,700m
|
1,800m
|
2,600m
|
2,400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 1300m |
-12°
|
-12°
|
-12°
|
-10°
|
-8°
|
-6°
|
| 900m |
-7°
|
-8°
|
-7°
|
-6°
|
-4°
|
-2°
|
| 600m |
-5°
|
-5°
|
-4°
|
-3°
|
-1°
|
0°
|
| 300m |
0°
|
0°
|
0°
|
2°
|
3°
|
5°
|
| Glen |
4°
|
4°
|
4°
|
5°
|
6°
|
7°
|
Additional weather information
Met Office Aberdeen meteorologist's view
Severe gales increasing to storm force winds making standing very difficult with a high chance of serious injury. Gust reaching over 90 mph across the higher summits in the afternoon and evening making any mobility almost impossible.
Weather
A dry mostly cloudy morning, sunny spells across Arran, but severe gales increasing to storm force winds across the summits. Rain spreads into the west coast around late morning, becoming widespread and heavy by early afternoon with summit winds continuing to strength. Persistent often heavy rain continuing through much of the night.
Chance of cloud-free hill tops
30-40% in the morning. Nil in the afternoon.
Low cloud and visibility
Variable visibility in the morning, with occasional cloud above 500-600m, mainly over Lochaber and northern Argyll, Hills largely cloud free further south. Persistent cloud lowering to 500m early afternoon, lower slopes by late afternoon.
Mountain weather information
Weather
Heavy rain may ease for a time around dawn and early morning, but further heavy persistent rain by the afternoon continuing into the night. Strong to gale force summit winds with a significant wind chill despite mild temperatures.
Chance of cloud-free hill tops
Nil
Maximum wind speed expected
Southwest 55 gusting 65 mph, easing to 45 gusting 55 mph for a few hours during the day. Southerly 60 gusting 75 mph late evening.
Temperature
- At 800m Plus 7 Celsius.
- Glen Plus 7 Celsius rising to 9 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Very poor visibility in heavy rain and persistent cloud to lower slopes.
Mountain weather information
Mon 15 Dec
Sunrise:
Sunset:
Heavy rain clearing early Monday to give a drier day, but often cloudy with a few showers likely. Strong southwest winds easing slightly in the afternoon. Freezing level above the summits, but dropping to 1200m in the afternoon, 1000m in the evening.
Tue 16 Dec
Sunrise:
Sunset:
Scattered showers, falling as snow above around 700-800m, but turning mostly dry through the day. Moderate to fresh southwest winds. Freezing level 800-900m.
Wed 17 Dec
Sunrise:
Sunset:
Rain, perhaps some summit snow, spreads east with south or southwest winds, a risk of summit gales. Drier later, but showers following in the west. Freezing level 800m rising above the summits for a time.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
Key
Mountain summits
Other points of interest
Cluster of multiple stations
Including Ben Nevis, Glen Coe and the rest of Lochaber, Argyll including the Isles, Loch Lomond, Trossachs and Arran
For snow and avalanche hazard forecasts please visit Scottish Avalanche Information Service