Other facts from our historical weather data: Which is the warmest month in Borgarfjordur Eystri? August has an average maximum temperature of 12°C (54°F) and is the warmest month of the year. Which is the coldest month in Borgarfjordur Eystri? The coldest month is December with an average maximum temperature of 3°C (37°F). Which is the wettest month in Borgarfjordur Eystri? October tops the wettest month list with 156mm (6.1 in) of rainfall. Which is the driest month in Borgarfjordur Eystri? June is the driest month with 71mm (2.8 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.