Portland Harbour Rainfall ForecastUnited KingdomSWDorsetPortland HarbourToday 17 May5%Sun 18 MayNo RainMon 19 MayNo RainTue 20 May10%Wed 21 May10%Thu 22 May5%Fri 23 May10%Portland Harbour rainfall forecast issued today at 1:39 pm. Next forecast at approx. 3:39 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