Other facts from our historical weather data: When is winter in Tadoussac? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Tadoussac? 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 Tadoussac? The coldest month is January with an average maximum temperature of -7°C (19°F). Which is the wettest month in Tadoussac? October tops the wettest month list with 130mm (5.1 in) of rainfall. Which is the driest month in Tadoussac? February is the driest month with 73mm (2.9 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.