Other facts from our historical weather data: When is winter in Saint-Simon-de-Rimouski? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Saint-Simon-de-Rimouski? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Saint-Simon-de-Rimouski? The coldest month is January with an average maximum temperature of -6°C (21°F). Which is the wettest month in Saint-Simon-de-Rimouski? October tops the wettest month list with 125mm (4.9 in) of rainfall. Which is the driest month in Saint-Simon-de-Rimouski? February is the driest month with 72mm (2.8 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.