Taking the local weather in Saint-Jean-de-Belleville into account can help you maximise your time at the pool during your trip. The hottest months are usually July and August, with an average temperature of 12°C, while the coldest months are January and February, with an average of -4°C. The rainiest months in Saint-Jean-de-Belleville are December, May, November and January, with each month seeing an average of 182 mm of rainfall.