Old St Mellons Wind ForecastUnited KingdomWLCardiffOld St Mellons1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast Met OfficeWind Real-Time Old St Mellons wind forecast issued today at 1:11 pm. Next forecast at approx. 1:11 am.Old St Mellons Wind Statistics September WindSt-athan (26km)2025AugustSeptemberStrongest 11 September, 202524.6mph WAverage September10.2mphStrongest 4 August, 202524.6mph WSWAverage August8.4mphStrongest 16 April, 202535.8mph WAverage 20257.9mphClimate (2011–Present)St-athan (26km)Take a look at our website widgetsAvailable free! Find Out MoreStrongest 7 December, 202447mph WAverage 2020–20257.7mphWind RoseAnnual (5 Year Average)5 Year Average Annual5 Year Average September27.5%15%2.5%CalmNear GaleSeptember Wind RoseSeptember (5 Year Average)5 Year Average Annual5 Year Average September20%11.25%2.5%CalmNear GaleGet WillyWeather+ to remove ads