Hamilton Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 68 °F20 °C Feb 68 °F20 °C Mar 68 °F20 °C Apr 71 °F22 °C May 73 °F23 °C Jun 80 °F27 °C Jul 82 °F28 °C Aug 84 °F29 °C Sep 84 °F29 °C Oct 77 °F25 °C Nov 75 °F24 °C Dec 68 °F20 °C Humidity Jan 59% Feb 63% Mar 63% Apr 64% May 60% Jun 69% Jul 65% Aug 64% Sep 63% Oct 63% Nov 62% Dec 58% Rain Jan 95mm Feb 69mm Mar 99mm Apr 21mm May 43mm Jun 105mm Jul 52mm Aug 60mm Sep 54mm Oct 32mm Nov 79mm Dec 71mm Clouds Jan 67% Feb 44% Mar 68% Apr 37% May 40% Jun 54% Jul 20% Aug 23% Sep 40% Oct 47% Nov 53% Dec 64% Air quality US AQI Jan 35 Feb 37 Mar 30 Apr 33 May 45 Jun 41 Jul 40 Aug 40 Sep 33 Oct 30 Nov 31 Dec 35 Sun Jan 4UVI Feb 5UVI Mar 6UVI Apr 8UVI May 8UVI Jun 7UVI Jul 9UVI Aug 9UVI Sep 7UVI Oct 5UVI Nov 4UVI Dec 3UVI