Portsmouth Harbour - Portchester Lake Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Portchester LakeToday 24 Jun45%Thu 25 Jun30%Fri 26 Jun35%Sat 27 Jun15%Sun 28 Jun10%Mon 29 Jun5%Portsmouth Harbour - Portchester Lake rainfall forecast issued today at 1:35 am. Next forecast at approx. 3:35 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Dean Hill (Wiltshire) Radar Rainfall Rainfall AccumulationGet WillyWeather+ to remove ads