San Diego, CA Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 63 °F17 °C Feb 59 °F15 °C Mar 63 °F17 °C Apr 66 °F19 °C May 64 °F18 °C Jun 67 °F20 °C Jul 72 °F22 °C Aug 73 °F23 °C Sep 75 °F24 °C Oct 72 °F22 °C Nov 68 °F20 °C Dec 63 °F17 °C Humidity Jan 68% Feb 65% Mar 75% Apr 72% May 73% Jun 80% Jul 78% Aug 80% Sep 77% Oct 68% Nov 71% Dec 73% Rain Jan 39mm Feb 59mm Mar 20mm Apr 6mm May 21mm Jun 17mm Jul 5mm Aug 3mm Sep 7mm Oct 3mm Nov 43mm Dec 70mm Clouds Jan 38% Feb 53% Mar 49% Apr 46% May 64% Jun 75% Jul 51% Aug 44% Sep 33% Oct 8% Nov 30% Dec 44% Air quality US AQI Jan 49 Feb 39 Mar 30 Apr 35 May 27 Jun 35 Jul 46 Aug 49 Sep 41 Oct 43 Nov 44 Dec 53 Sun Jan 4UVI Feb 4UVI Mar 6UVI Apr 7UVI May 6UVI Jun 7UVI Jul 9UVI Aug 9UVI Sep 8UVI Oct 6UVI Nov 4UVI Dec 3UVI