Whistler Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 36 °F2 °C Feb 28 °F-3 °C Mar 37 °F3 °C Apr 45 °F7 °C May 59 °F15 °C Jun 60 °F16 °C Jul 63 °F17 °C Aug 64 °F18 °C Sep 55 °F13 °C Oct 45 °F7 °C Nov 43 °F6 °C Dec 34 °F1 °C Humidity Jan 79% Feb 66% Mar 72% Apr 78% May 68% Jun 71% Jul 80% Aug 78% Sep 89% Oct 81% Nov 77% Dec 86% Rain Jan 95mm Feb 31mm Mar 27mm Apr 53mm May 31mm Jun 79mm Jul 71mm Aug 41mm Sep 145mm Oct 68mm Nov 52mm Dec 72mm Clouds Jan 58% Feb 40% Mar 36% Apr 62% May 38% Jun 47% Jul 51% Aug 46% Sep 57% Oct 61% Nov 47% Dec 77% Air quality US AQI Jan 28 Feb 22 Mar 26 Apr 20 May 20 Jun 15 Jul 19 Aug 27 Sep 18 Oct 31 Nov 34 Dec 29 Sun Jan 1UVI Feb 1UVI Mar 3UVI Apr 4UVI May 5UVI Jun 6UVI Jul 6UVI Aug 5UVI Sep 4UVI Oct 2UVI Nov 1UVI Dec 0UVI