If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Downtown Squamish: The hottest months are usually August and July, with an average temperature of 14°C, while the coldest months are February and December, with an average of 1°C. The snowiest months in Downtown Squamish are January, February, March and December, with each month seeing an average of 18 cm of snowfall.