Other facts from our historical weather data: Which is the warmest month in Ulsteinvik? August has an average maximum temperature of 16°C (61°F) and is the warmest month of the year. Which is the coldest month in Ulsteinvik? The coldest month is February with an average maximum temperature of 4°C (39°F). Which is the wettest month in Ulsteinvik? September tops the wettest month list with 234mm (9.2 in) of rainfall. Which is the driest month in Ulsteinvik? May is the driest month with 109mm (4.3 in) of precipitation. Which is the sunniest month in Ulsteinvik? May is the sunniest month with an average of 180 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.