Other facts from our historical weather data: Which is the warmest month in Hvolsvöllur? July has an average maximum temperature of 16°C (61°F) and is the warmest month of the year. Which is the coldest month in Hvolsvöllur? The coldest month is February with an average maximum temperature of 4°C (39°F). Which is the wettest month in Hvolsvöllur? February tops the wettest month list with 191mm (7.5 in) of rainfall. Which is the driest month in Hvolsvöllur? June is the driest month with 96mm (3.8 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.