Siem Reap Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 90 °F32 °C Feb 91 °F33 °C Mar 93 °F34 °C Apr 95 °F35 °C May 93 °F34 °C Jun 91 °F33 °C Jul 90 °F32 °C Aug 88 °F31 °C Sep 86 °F30 °C Oct 88 °F31 °C Nov 86 °F30 °C Dec 88 °F31 °C Humidity Jan 59% Feb 62% Mar 63% Apr 67% May 74% Jun 76% Jul 78% Aug 84% Sep 85% Oct 81% Nov 74% Dec 65% Rain Jan 4mm Feb 10mm Mar 39mm Apr 80mm May 89mm Jun 159mm Jul 165mm Aug 201mm Sep 180mm Oct 126mm Nov 33mm Dec 2mm Clouds Jan 44% Feb 19% Mar 28% Apr 65% May 86% Jun 84% Jul 92% Aug 92% Sep 86% Oct 69% Nov 65% Dec 36% Air quality US AQI Jan 127 Feb 90 Mar 80 Apr 62 May 56 Jun 57 Jul 59 Aug 62 Sep 63 Oct 91 Nov 79 Dec 114 Sun Jan 8UVI Feb 11UVI Mar 11UVI Apr 8UVI May 7UVI Jun 7UVI Jul 6UVI Aug 6UVI Sep 7UVI Oct 8UVI Nov 7UVI Dec 7UVI