Portland Harbour Rainfall ForecastUnited KingdomSWDorsetPortland HarbourToday 4 Dec95%Thu 5 Dec85%Fri 6 Dec85%Sat 7 Dec15%Sun 8 Dec10%Mon 9 Dec10%Portland Harbour rainfall forecast issued today at 12:38 am. Next forecast at approx. 2:38 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