Portsmouth Rainfall ForecastUnited StatesRINewport CountyPortsmouthToday 17 AprNo RainFri 18 Apr10%Sat 19 Apr20%Sun 20 Apr20%Mon 21 Apr20%Tue 22 Apr50%Wed 23 Apr20%Portsmouth rainfall forecast issued yesterday at 11:04 pm. Next forecast at approx. 1:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Boston RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads