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 7:21 am. Next forecast at approx. 7:21 pm.Portsmouth Harbour - Portchester Castle Wind Statistics April WindThorney Island (13km)2024MarchAprilStrongest 9 April, 202435.8mph SSWAverage April13.8mphStrongest 28 March, 202438mph SSWAverage March9.6mphStrongest 2 January, 202442.5mph WAverage 202410.6mphClimate (2011–Present)Thorney Island (13km)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 7 March, 202051.4mph SWAverage 2019–20249mphWind RoseAnnual (5 Year Average)5 Year Average Annual5 Year Average April15%8.75%2.5%CalmNear GaleApril Wind RoseApril (5 Year Average)5 Year Average Annual5 Year Average April20%11.25%2.5%CalmNear GaleGet an account to remove ads