Other facts from our historical weather data: When is winter in Bonavista? The coldest season / winter is in the following months: January, February and March. Which is the warmest month in Bonavista? 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 Bonavista? The coldest month is February with an average maximum temperature of -0°C (32°F). Which is the wettest month in Bonavista? December tops the wettest month list with 130mm (5.1 in) of rainfall. Which is the driest month in Bonavista? May is the driest month with 92mm (3.6 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.