Other facts from our historical weather data: Which months have the greatest rainfall in Fort Augustus? Most rainfall (rainy season) is seen in January and February. Which is the warmest month in Fort Augustus? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Fort Augustus? The coldest month is February with an average maximum temperature of 6°C (43°F). Which is the wettest month in Fort Augustus? January tops the wettest month list with 167mm (6.6 in) of rainfall. Which is the driest month in Fort Augustus? April is the driest month with 97mm (3.8 in) of precipitation. Which is the sunniest month in Fort Augustus? May is the sunniest month with an average of 178 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.