Other facts from our historical weather data: Which is the warmest month in Belsay? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Belsay? The coldest month is January with an average maximum temperature of 8°C (46°F). Which is the wettest month in Belsay? August tops the wettest month list with 84mm (3.3 in) of rainfall. Which is the driest month in Belsay? March is the driest month with 58mm (2.3 in) of precipitation. Which is the sunniest month in Belsay? May is the sunniest month with an average of 183 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.