Taking the local weather in Rivière-Saint-Jean into account can help you maximise your time at the pool during your trip. The hottest months are usually August and July, with an average temperature of 15°C, while the coldest months are February and January, with an average of -7°C. The snowiest months in Rivière-Saint-Jean are March, February, April and January, with each month seeing an average of 48 cm of snowfall.