Salem, MA Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 32 °F0 °C Feb 35 °F2 °C Mar 39 °F4 °C Apr 54 °F12 °C May 59 °F15 °C Jun 70 °F21 °C Jul 81 °F27 °C Aug 77 °F25 °C Sep 70 °F21 °C Oct 59 °F15 °C Nov 48 °F9 °C Dec 36 °F2 °C Humidity Jan 59% Feb 54% Mar 53% Apr 66% May 66% Jun 73% Jul 67% Aug 70% Sep 65% Oct 70% Nov 62% Dec 66% Rain Jan 74mm Feb 54mm Mar 50mm Apr 74mm May 48mm Jun 67mm Jul 85mm Aug 68mm Sep 34mm Oct 76mm Nov 67mm Dec 79mm Clouds Jan 47% Feb 41% Mar 36% Apr 63% May 52% Jun 46% Jul 22% Aug 29% Sep 24% Oct 61% Nov 32% Dec 43% 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 2UVI Feb 3UVI Mar 4UVI Apr 5UVI May 6UVI Jun 7UVI Jul 8UVI Aug 7UVI Sep 6UVI Oct 4UVI Nov 2UVI Dec 1UVI