Portsmouth Harbour - Portchester Castle Wind ForecastUnited KingdomSEHampshirePortsmouth Harbour - Portchester Castle1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Portsmouth Harbour - Portchester Castle wind forecast issued today at 1:09 pm. Next forecast at approx. 1:09 am.Portsmouth Harbour - Portchester Castle Wind Statistics June WindThorney Island (13km)2025MayJuneStrongest 3 June, 202526.8mph SWAverage June9.4mphStrongest 27 May, 202526.8mph WSWAverage May8.2mphStrongest 1 January, 202535.8mph SWAverage 20258mphClimate (2011–Present)Thorney Island (13km)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 18 February, 202249.2mph WSWAverage 2020–20258.5mphWind 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