The Met Office says it has made "major improvements" to its Mountain Forecast.
The service aims to provide forecasts for peaks and upland areas across Great Britain, including most of the high ground in Scotland.
It also covers the Lake District, Yorkshire Dales, Peak District, Snowdonia and Brecon Beacons.
Mountain weather research in Scotland has helped to create the updated service.
The service has been updated for the summer walking season.
It also follows research commissioned by the Met Office that suggests more than half the people in the UK who head outdoors have been caught out by bad weather.
The survey also suggests that one third of those who regard themselves as outdoor enthusiasts said they had put themselves in a dangerous situation by not checking the weather.
The Met Office said it would be able to give more detail in its area-specific forecasts for weather conditions in three-hourly periods.
The conditions include wind speed and direction, temperature, the probability of rain or snow, visibility levels and whether cloud is expected over hill tops.