Grass Holm Rainfall ForecastUnited KingdomOSOrkney IslandsGrass HolmToday 9 May75%Sun 10 May85%Mon 11 May60%Tue 12 May60%Wed 13 May55%Thu 14 May55%Fri 15 May10%Grass Holm rainfall forecast issued today at 7:37 am. Next forecast at approx. 9:37 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Hill of Dudwick (Aberdeenshire) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads