Princeton, NJ Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 36 °F2 °C Feb 39 °F4 °C Mar 46 °F8 °C Apr 62 °F17 °C May 72 °F22 °C Jun 77 °F25 °C Jul 84 °F29 °C Aug 82 °F28 °C Sep 77 °F25 °C Oct 64 °F18 °C Nov 49 °F10 °C Dec 43 °F6 °C Humidity Jan 61% Feb 65% Mar 57% Apr 66% May 76% Jun 70% Jul 75% Aug 81% Sep 73% Oct 73% Nov 64% Dec 68% Rain Jan 89mm Feb 60mm Mar 77mm Apr 103mm May 102mm Jun 124mm Jul 163mm Aug 99mm Sep 41mm Oct 89mm Nov 43mm Dec 89mm Clouds Jan 51% Feb 42% Mar 32% Apr 58% May 65% Jun 38% Jul 19% Aug 41% Sep 24% Oct 52% Nov 39% Dec 51% Air quality US AQI Jan 32 Feb 33 Mar 28 Apr 29 May 29 Jun 34 Jul 36 Aug 34 Sep 28 Oct 25 Nov 31 Dec 34 Sun Jan 2UVI Feb 3UVI Mar 4UVI Apr 6UVI May 7UVI Jun 7UVI Jul 9UVI Aug 7UVI Sep 6UVI Oct 4UVI Nov 2UVI Dec 2UVI
