Taking the local weather in Saint-Sylvestre 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 16°C, while the coldest months are January and February, with an average of -8°C. The snowiest months in Saint-Sylvestre are February, January, March and April, with each month seeing an average of 249 cm of snowfall.