Portsmouth Harbour - Inner Wind ForecastUnited KingdomSEHampshirePortsmouth Harbour - Inner1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Portsmouth Harbour - Inner wind forecast issued today at 1:13 pm. Next forecast at approx. 1:13 am.Portsmouth Harbour - Inner Wind Statistics May WindThorney Island (13km)2026AprilMayStrongest 5 May, 202613.4mph NEAverage May4.5mphStrongest 5 April, 202633.6mph WAverage April9.5mphStrongest 24 March, 202635.8mph WAverage 20269.1mphClimate (2011–Present)Thorney Island (13km)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 18 February, 202249.2mph WSWAverage 2021–20268.5mphWind RoseAnnual (5 Year Average)5 Year Average Annual5 Year Average May15%8.75%2.5%CalmGaleMay Wind RoseMay (5 Year Average)5 Year Average Annual5 Year Average May15%8.75%2.5%CalmGaleGet WillyWeather+ to remove ads