Portland Rainfall ForecastUnited KingdomSWDorsetPortlandToday 13 May60%Thu 14 May70%Fri 15 May30%Sat 16 May35%Sun 17 May35%Mon 18 May45%Portland rainfall forecast issued today at 1:36 am. Next forecast at approx. 3:36 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Dean Hill (Wiltshire) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads