Plan your trip to the beach with a look at weather throughout the year in Temiscouata-sur-le-Lac: 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 -9°C. The snowiest months in Temiscouata-sur-le-Lac are April, February, January and March, with each month seeing an average of 192 cm of snowfall.