Grantham Rainfall ForecastUnited KingdomEMLincolnshireGranthamToday 1 Feb80%Mon 2 Feb45%Tue 3 Feb55%Wed 4 Feb40%Thu 5 Feb20%Fri 6 Feb25%Sat 7 Feb15%Grantham rainfall forecast issued today at 6:36 am. Next forecast at approx. 8:36 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Ingham (Lincolnshire) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads