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 6:13 pm. Next forecast at approx. 6:13 am.Portsmouth Harbour - Portchester Castle Wind Statistics December WindThorney Island (13km)2024NovemberDecemberStrongest 1 December, 202417.9mph SAverage December10.1mphStrongest 23 November, 202435.8mph SSWAverage November7.2mphStrongest 2 January, 202442.5mph WAverage 20248.2mphClimate (2011–Present)Thorney Island (13km)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 7 March, 202051.4mph SWAverage 2019–20248.8mphWind RoseAnnual (5 Year Average)5 Year Average Annual5 Year Average December15%8.75%2.5%CalmStrong GaleDecember Wind RoseDecember (5 Year Average)5 Year Average Annual5 Year Average December20%11.25%2.5%CalmStrong GaleGet WillyWeather+ to remove ads