St Mellons Rainfall ForecastUnited KingdomWLCardiffSt MellonsToday 5 Oct75%Tue 6 Oct50%Wed 7 Oct50%Thu 8 Oct80%Fri 9 Oct60%Sat 10 Oct10%Sun 11 Oct40%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 1:08 pm. Next forecast at approx. 3:08 am. Rainfall Rainfall AccumulationCobbacombe Cross (Devon) RadarGet WillyWeather+ to remove ads