Portland Harbour Rainfall ForecastUnited KingdomSWDorsetPortland HarbourToday 3 Nov10%Tue 4 Nov90%Wed 5 Nov60%Thu 6 Nov15%Fri 7 Nov60%Sat 8 Nov5%Sun 9 Nov45%Portland Harbour rainfall forecast issued today at 12:36 pm. Next forecast at approx. 2:36 am.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