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 1:16 am. Next forecast at approx. 1:16 pm.Portsmouth Harbour - HMNB Portsmouth Wind Statistics September WindThorney Island (8.1 miles)2021AugustSeptemberStrongest 10 September, 202117.9mph WSWAverage September5.7mphStrongest 6 August, 202124.6mph WSWAverage August8mphStrongest 21 May, 202140.3mph SWAverage 20218.2mphClimate (2011–Present)Thorney Island (8.1 miles)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 7 March, 202051.4mph SWAverage 2011–Present9mphWind RoseAnnual (5 Year Average)5 Year Average Annual5 Year Average September15%8.75%2.5%CalmNear GaleSeptember Wind RoseSeptember (5 Year Average)5 Year Average Annual5 Year Average September17.5%10%2.5%CalmNear GaleGet an account to remove ads