Portland Harbour Rainfall ForecastUnited KingdomSWDorsetPortland HarbourToday 30 JunNo RainTue 1 Jul5%Wed 2 Jul5%Thu 3 JulNo RainFri 4 JulNo RainSat 5 Jul55%Sun 6 Jul40%Portland Harbour rainfall forecast issued today at 7:37 pm. Next forecast at approx. 9:37 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