Grantham Rainfall ForecastUnited KingdomEMLincolnshireGranthamToday 13 May5%Wed 14 May5%Thu 15 May5%Fri 16 May10%Sat 17 May10%Sun 18 May10%Grantham rainfall forecast issued today at 1:37 am. Next forecast at approx. 3:37 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