Salem, OR Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 46 °F8 °C Feb 43 °F6 °C Mar 52 °F11 °C Apr 57 °F14 °C May 64 °F18 °C Jun 71 °F22 °C Jul 75 °F24 °C Aug 77 °F25 °C Sep 68 °F20 °C Oct 57 °F14 °C Nov 52 °F11 °C Dec 45 °F7 °C Humidity Jan 84% Feb 83% Mar 74% Apr 79% May 72% Jun 67% Jul 67% Aug 67% Sep 77% Oct 77% Nov 83% Dec 88% Rain Jan 37mm Feb 70mm Mar 31mm Apr 46mm May 26mm Jun 12mm Jul 10mm Aug 11mm Sep 45mm Oct 41mm Nov 23mm Dec 51mm Clouds Jan 67% Feb 78% Mar 45% Apr 65% May 40% Jun 24% Jul 29% Aug 24% Sep 50% Oct 34% Nov 62% Dec 75% Air quality US AQI Jan 24 Feb 18 Mar 18 Apr 15 May 17 Jun 13 Jul 16 Aug 22 Sep 19 Oct 29 Nov 38 Dec 38 Sun Jan 1UVI Feb 2UVI Mar 3UVI Apr 4UVI May 5UVI Jun 7UVI Jul 7UVI Aug 7UVI Sep 5UVI Oct 3UVI Nov 2UVI Dec 1UVI