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 1:09 am. Next forecast at approx. 1:09 pm.Portsmouth Harbour - HMNB Portsmouth Wind Statistics July WindThorney Island (13km)2025JuneJulyStrongest 5 July, 202522.4mph WSWAverage July6.7mphStrongest 3 June, 202526.8mph SWAverage June9.3mphStrongest 1 January, 202535.8mph SWAverage 20257.9mphClimate (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 July15%8.75%2.5%CalmStrongJuly Wind RoseJuly (5 Year Average)5 Year Average Annual5 Year Average July25%13.75%2.5%CalmStrongGet WillyWeather+ to remove ads