San Mateo, CA Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 57 °F 14 °C Feb 54 °F 12 °C Mar 59 °F 15 °C Apr 62 °F 17 °C May 61 °F 16 °C Jun 66 °F 19 °C Jul 66 °F 19 °C Aug 68 °F 20 °C Sep 68 °F 20 °C Oct 66 °F 19 °C Nov 62 °F 17 °C Dec 55 °F 13 °C Humidity Jan 71% Feb 67% Mar 68% Apr 72% May 74% Jun 72% Jul 76% Aug 78% Sep 70% Oct 51% Nov 63% Dec 77% Rain Jan 66mm Feb 131mm Mar 58mm Apr 11mm May 30mm Jun 15mm Jul 7mm Aug 6mm Sep 8mm Oct 4mm Nov 29mm Dec 58mm Clouds Jan 51% Feb 51% Mar 57% Apr 48% May 57% Jun 38% Jul 40% Aug 38% Sep 20% Oct 10% Nov 28% Dec 70% Air quality US AQI Jan 36 Feb 22 Mar 26 Apr 32 May 31 Jun 41 Jul 34 Aug 36 Sep 37 Oct 38 Nov 41 Dec 41 Sun Jan 2UVI Feb 3UVI Mar 5UVI Apr 6UVI May 6UVI Jun 8UVI Jul 8UVI Aug 8UVI Sep 7UVI Oct 5UVI Nov 3UVI Dec 2UVI
