Other facts from our historical weather data: Which months have the greatest rainfall in Helle? Most rainfall (rainy season) is seen in January, August, September, October, November and December. Which is the warmest month in Helle? August has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Helle? The coldest month is February with an average maximum temperature of 5°C (41°F). Which is the wettest month in Helle? October tops the wettest month list with 206mm (8.1 in) of rainfall. Which is the driest month in Helle? May is the driest month with 80mm (3.1 in) of precipitation. Which is the sunniest month in Helle? June is the sunniest month with an average of 275 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.