Portsmouth Harbour - HMNB Portsmouth Wind ForecastUnited KingdomSEHampshirePortsmouth Harbour - HMNB Portsmouth1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Portsmouth Harbour - HMNB Portsmouth wind forecast issued today at 12:02 pm. Next forecast at approx. 12:02 am.Portsmouth Harbour - HMNB Portsmouth Wind Statistics April WindThorney Island (8.1 miles)2021MarchAprilStrongest 1 April, 202117.9mph NEAverage April8mphStrongest 11 March, 202138mph WSWAverage March9.2mphStrongest 11 March, 202138mph WSWAverage 20219.3mphClimate (2011–Present)Thorney Island (8.1 miles)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 7 March, 202051.4mph SWAverage 2011–Present9.2mphWind 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