Johnstone Castle Rainfall ForecastUnited KingdomSTRenfrewshireJohnstone CastleToday 23 Jul15%Fri 24 Jul55%Sat 25 Jul60%Sun 26 Jul30%Mon 27 Jul50%Tue 28 Jul55%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Johnstone Castle rainfall forecast issued today at 1:22 am. Next forecast at approx. . Rainfall Rainfall AccumulationHolehead (Stirling) RadarGet WillyWeather+ to remove ads