Portsmouth Harbour - Haslar Marina Wind ForecastUnited KingdomSEHampshirePortsmouth Harbour - Haslar Marina1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Portsmouth Harbour - Haslar Marina wind forecast issued today at 1:11 am. Next forecast at approx. 1:11 pm. Wind Speed Wind GustPortsmouth Harbour - Haslar Marina Wind Statistics July WindThorney Island (14km)2026JuneJulyStrongest 12 July, 202624.6mph ENEAverage July9.1mphStrongest 6 June, 202631.3mph SWAverage June9.7mphStrongest 24 March, 202635.8mph WAverage 20269mphClimate (2021–2026)Thorney Island (14km)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 July15%8.75%2.5%CalmStrongJuly Wind RoseJuly (5 Year Average)5 Year Average Annual5 Year Average July25%13.75%2.5%CalmStrongGet WillyWeather+ to remove ads