Other facts from our historical weather data: When is winter in Blönduós? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Blönduós? July has an average maximum temperature of 13°C (55°F) and is the warmest month of the year. Which is the coldest month in Blönduós? The coldest month is February with an average maximum temperature of 2°C (36°F). Which is the wettest month in Blönduós? September tops the wettest month list with 116mm (4.6 in) of rainfall. Which is the driest month in Blönduós? June is the driest month with 56mm (2.2 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.