Biarritz Weather OverviewScoresFors & AgainstsWeatherPhotos Average Temperature Jan 50 °F10 °C Feb 59 °F15 °C Mar 57 °F14 °C Apr 61 °F16 °C May 61 °F16 °C Jun 70 °F21 °C Jul 73 °F23 °C Aug 75 °F24 °C Sep 72 °F22 °C Oct 66 °F19 °C Nov 55 °F13 °C Dec 55 °F13 °C Humidity Jan 81% Feb 70% Mar 72% Apr 76% May 79% Jun 80% Jul 81% Aug 80% Sep 80% Oct 81% Nov 85% Dec 81% Rain Jan 70mm Feb 19mm Mar 17mm Apr 67mm May 62mm Jun 215mm Jul 43mm Aug 39mm Sep 36mm Oct 54mm Nov 155mm Dec 88mm Clouds Jan 82% Feb 49% Mar 62% Apr 68% May 65% Jun 60% Jul 52% Aug 61% Sep 49% Oct 78% Nov 89% Dec 71% Air quality US AQI Jan 34 Feb 36 Mar 29 Apr 24 May 26 Jun 25 Jul 31 Aug 24 Sep 29 Oct 24 Nov 26 Dec 37 Sun Jan 1UVI Feb 3UVI Mar 4UVI Apr 4UVI May 5UVI Jun 7UVI Jul 7UVI Aug 6UVI Sep 5UVI Oct 3UVI Nov 2UVI Dec 1UVI