Other facts from our historical weather data: When is summer in Brigham City?The hottest season / summer takes place in June, July, August and September. Which is the warmest month in Brigham City? July has an average maximum temperature of 31°C (88°F) and is the warmest month of the year. Which is the coldest month in Brigham City? The coldest month is January with an average maximum temperature of 1°C (34°F). Which is the wettest month in Brigham City? May tops the wettest month list with 73mm (2.9 in) of rainfall. Which is the driest month in Brigham City? July is the driest month with 8mm (0.3 in) of precipitation. 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.