Other facts from our historical weather data: Which is the warmest month in Kirkjubæjarklaustur? July has an average maximum temperature of 15°C (59°F) and is the warmest month of the year. Which is the coldest month in Kirkjubæjarklaustur? The coldest month is December with an average maximum temperature of 4°C (39°F). Which is the wettest month in Kirkjubæjarklaustur? September tops the wettest month list with 217mm (8.5 in) of rainfall. Which is the driest month in Kirkjubæjarklaustur? May is the driest month with 126mm (5 in) of precipitation. Which is the sunniest month in Kirkjubæjarklaustur? May is the sunniest month with an average of 164 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.