Other facts from our historical weather data: Which months have the greatest rainfall in St. Moritz? Most rainfall (rainy season) is seen in June, July and August. Which is the warmest month in St. Moritz? 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 St. Moritz? The coldest month is January with an average maximum temperature of -6°C (21°F). Which is the wettest month in St. Moritz? June tops the wettest month list with 160mm (6.3 in) of rainfall. Which is the driest month in St. Moritz? February is the driest month with 70mm (2.8 in) of precipitation. Which is the sunniest month in St. Moritz? July is the sunniest month with an average of 200 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.