Other facts from our historical weather data: Which is the warmest month in Anchorage? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Anchorage? The coldest month is January with an average maximum temperature of -5°C (23°F). Which is the wettest month in Anchorage? September tops the wettest month list with 131mm (5.2 in) of rainfall. Which is the driest month in Anchorage? May is the driest month with 39mm (1.5 in) of precipitation. Which is the sunniest month in Anchorage? May is the sunniest month with an average of 289 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.