Cayenne Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 83 °F29 °C Feb 84 °F29 °C Mar 85 °F30 °C Apr 85 °F30 °C May 85 °F30 °C Jun 86 °F30 °C Jul 86 °F30 °C Aug 88 °F31 °C Sep 90 °F32 °C Oct 89 °F32 °C Nov 88 °F31 °C Dec 85 °F30 °C Humidity Jan 81% Feb 77% Mar 76% Apr 80% May 85% Jun 83% Jul 80% Aug 77% Sep 76% Oct 75% Nov 77% Dec 82% Rain Jan 29mm Feb 15mm Mar 11mm Apr 30mm May 66mm Jun 156mm Jul 59mm Aug 37mm Sep 14mm Oct 13mm Nov 21mm Dec 63mm Clouds Jan 38% Feb 68% Mar 63% Apr 79% May 86% Jun 78% Jul 43% Aug 31% Sep 48% Oct 42% Nov 49% Dec 75% Air quality US AQI Jan 47 Feb 34 Mar 36 Apr 50 May 9 Jun 42 Jul 23 Aug 21 Sep 34 Oct 34 Nov 45 Dec 30 Sun Jan 10UVI Feb 4UVI Mar 8UVI Apr 4UVI May 6UVI Jun 4UVI Jul 11UVI Aug 11UVI Sep 5UVI Oct 10UVI Nov 4UVI Dec 7UVI