Other facts from our historical weather data: Which is the warmest month in Flateyri? July has an average maximum temperature of 11°C (52°F) and is the warmest month of the year. Which is the coldest month in Flateyri? The coldest month is February with an average maximum temperature of 1°C (34°F). Which is the wettest month in Flateyri? December tops the wettest month list with 154mm (6.1 in) of rainfall. Which is the driest month in Flateyri? June is the driest month with 52mm (2 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.