Portsmouth Harbour - Royal Clarence Marina Wind ForecastUnited KingdomSEHampshirePortsmouth Harbour - Royal Clarence Marina1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Portsmouth Harbour - Royal Clarence Marina wind forecast issued today at 1:11 pm. Next forecast at approx. 1:11 am.Portsmouth Harbour - Royal Clarence Marina Wind Statistics August WindThorney Island (14km)2025JulyAugustStrongest 1 August, 202511.2mph NNWAverage August4.5mphStrongest 15 July, 202524.6mph WSWAverage July7.2mphStrongest 1 January, 202535.8mph SWAverage 20257.8mphClimate (2011–Present)Thorney Island (14km)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 18 February, 202249.2mph WSWAverage 2020–20258.4mphWind RoseAnnual (5 Year Average)5 Year Average Annual5 Year Average August15%8.75%2.5%CalmNear GaleAugust Wind RoseAugust (5 Year Average)5 Year Average Annual5 Year Average August22.5%12.5%2.5%CalmNear GaleGet WillyWeather+ to remove ads