Portsmouth Harbour - Portchester Lake Wind ForecastUnited KingdomSEHampshirePortsmouth Harbour - Portchester Lake1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Portsmouth Harbour - Portchester Lake wind forecast issued today at 7:09 pm. Next forecast at approx. 7:09 am. Wind Speed Wind GustPortsmouth Harbour - Portchester Lake Wind Statistics June WindThorney Island (13km)2026MayJuneStrongest 6 June, 202631.3mph SWAverage June12mphStrongest 13 May, 202622.4mph WAverage May6.8mphStrongest 24 March, 202635.8mph WAverage 20269.2mphClimate (2021–2026)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 June15%8.75%2.5%CalmNear GaleJune Wind RoseJune (5 Year Average)5 Year Average Annual5 Year Average June17.5%10%2.5%CalmNear GaleGet WillyWeather+ to remove ads