Rosario Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 84 °F29 °C Feb 82 °F28 °C Mar 77 °F25 °C Apr 73 °F23 °C May 64 °F18 °C Jun 63 °F17 °C Jul 59 °F15 °C Aug 63 °F17 °C Sep 67 °F20 °C Oct 72 °F22 °C Nov 82 °F28 °C Dec 82 °F28 °C Humidity Jan 74% Feb 63% Mar 67% Apr 68% May 77% Jun 82% Jul 71% Aug 66% Sep 55% Oct 68% Nov 63% Dec 48% Rain Jan 136mm Feb 40mm Mar 49mm Apr 52mm May 44mm Jun 31mm Jul 16mm Aug 5mm Sep 13mm Oct 50mm Nov 28mm Dec 42mm Clouds Jan 38% Feb 15% Mar 32% Apr 46% May 70% Jun 59% Jul 63% Aug 49% Sep 8% Oct 57% Nov 30% Dec 35% Sun Jan 10UVI Feb 12UVI Mar 8UVI Apr 5UVI May 3UVI Jun 3UVI Jul 3UVI Aug 4UVI Sep 6UVI Oct 8UVI Nov 11UVI Dec 10UVI