The warmest months are June, July, August, and September when temperatures are usually between 10°C and 23°C (50-74°F). However, Squamish sometimes see temps as high as the mid-30s (mid-90s °F). It rains a lot in Squamish. The driest months are June, July, August, and September. But since you can expect rain at any time of year, it's a good idea to bring a tarp if you are camping in Squamish. Expect to find snow on the ground and temperatures close to freezing between late November and late February, especially in the Squamish River Valley.