MWIS is Supported By

Scottish Mountain Gear Scottish Mountain Gear Scottish Mountain Gear Scottish Mountain Gear Scottish Mountain Gear

Welcome to the Mountain Weather Information Service

MWIS currently produce forecasts for 8 different mountain areas of the UK as an aid to mountain safety.

Forecasts are produced manually using information from a range of forecast models and forecasters knowledge of mountain weather. New forecasts, for the next three days are produced by 4:30pm daily, normally earlier in the winter, and amended as necessary.

The production of the Scottish forecasts is fully funded by the Scottish Government through sportscotland with the support of The Mountaineering Council of Scotland.

As always, please continue to give us feedback about what you think of our website, service and future development plans.

Observations from mountain summits

Monday 6th July 08:00 BST  
Cairngorm (1245m)   n/a      n/a 
Aonach Mor (1130m)  6.6C SW   5mph 
Cairnwell (933m)    n/a     n/a
Great Dun Fell (N. Pennines) (847m)  8.0C SW  20 gusts 32mph
Bealach na ba (Wester Ross) (773m)  7.8C  SW  10mph


Planning video, updated Sunday 28th June: becoming very warm but thundery

We are trialling forecast videos concentrating on the outlook period. They do take time to prepare, will be updated two or three times a week: generally around Tuesday, when there is some clarity on the weekend to come, and over the weekend with a look forward to the coming week. 

As with all our forecasts, please give us feedback.

Feedback from users

We are always grateful for feedback from those using the service. Here is the text of an email that came in early May.

I would be interested to know the time of day for which the forecast applies please. Some descriptions on the site explain changes during the day, but most are a fixed time. I would guess that it applies to about midday?

I imagine that it would be too hard to give more than one time forecast - for example for those of us idiots who camp wild in the hills. Is there any background information available please on how much temperatures usually drop at night?

Thank you for your fantastic service, I really do value it very highly.

In response, during the winter when daylight hours are few; forecasts tend to concentrate on midday, and will mention changes only when very marked. At other times of the year, we keep in mind that for example in Scotland, views from several Munros could be bagged in an afternoon and during evening daylight, after say a wet and windy morning. We thus try to present a picture that includes major changes occurring from just after dawn to before dusk. Nevertheless, where the weather is fairly constant, descriptions are tailored toward the 'middle of the day' weather. 

We are aware of those who might be on the hills all night. We confine ourselves to making comment relating to significant overnight deterioration: 'severe upland gales overnight', or particularly during the summer season we might write 'frost many valleys overnight'. - This is a difficult area, what is presented in the forecasts is a balance between time constraints in getting forecasts issued, of writing so much text that it is impossible for many to take in the detail, and yet for safety reasons being aware that some, including Mountain Rescue Teams, might well be on a mountain all night.

Temperatures at night on exposed (to the wind) higher areas actually drop very little, except on almost still clear nights. But in even a shallow valley (or even an area sheltered by woodland), temperatures may well drop markedly. Perhaps on a night with a gentle breeze, the warmest place to camp is above the valley floor where there is just enough breeze to keep the temperature up. Such places may not always be obvious, as during the night, the depth of the 'lake' of cold still valley air may well increase and the temperature at the camp may still drop, sometimes suddenly.

In association with
Mountaineering Council of Scotland sportscotland Association of Mountaineering Instructions