Other facts from our historical weather data: Which is the warmest month in Stykkishólmur? July has an average maximum temperature of 14°C (57°F) and is the warmest month of the year. Which is the coldest month in Stykkishólmur? The coldest month is February with an average maximum temperature of 3°C (37°F). Which is the wettest month in Stykkishólmur? September tops the wettest month list with 135mm (5.3 in) of rainfall. Which is the driest month in Stykkishólmur? June is the driest month with 63mm (2.5 in) of precipitation. Which is the sunniest month in Stykkishólmur? May is the sunniest month with an average of 182 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.