Johnstone Rainfall ForecastUnited KingdomSTRenfrewshireJohnstoneToday 18 Sep85%Fri 19 Sep10%Sat 20 Sep80%Sun 21 Sep15%Mon 22 Sep5%Tue 23 Sep5%Wed 24 Sep10%Johnstone rainfall forecast issued today at 1:37 pm. Next forecast at approx. 3:37 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Holehead (Stirling) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads