The weather in the mountains can change quickly, and there are major differences between urban and upland weather. In general, mountain weather can be much more extreme than down in the valleys, and you can pretty much guarantee that it will be colder, wetter and windier the higher you climb.
General forecasts are for sea level, so always check a mountain-specific weather forecast and use the information as part of your planning.
These are available online for some areas at www.mwis.org.uk and www.metoffice.gov.uk.
Mountain Weather Information Service: Independent mountain forecasting, with in-depth Scottish forecasts funded by the Scottish Government with the support of The Mountaineering Council of Scotland.
Met Office Mountain Forecast: Mountain weather forecasts and warnings from the UK's national weather service.
Scottish Avalanche Information Service: Vital daily avalanche reports and forecasts from the five most popular mountain areas in Scotland over winter.
Yr.No: A service from the Meteorological Institu te and NRK