St Mellons Rainfall ForecastUnited KingdomWLCardiffSt MellonsToday 20 Aug80%Fri 21 Aug65%Sat 22 Aug5%Sun 23 AugNo RainMon 24 Aug35%Tue 25 Aug60%Wed 26 Aug60%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time St Mellons rainfall forecast issued today at 7:10 pm. Next forecast at approx. 9:10 am. Rainfall Rainfall AccumulationCobbacombe Cross (Devon) RadarGet WillyWeather+ to remove ads