Rainfall/ Precipitation in Edinburgh, Scotland, Uk. 1  Edinburgh, Scotland is entrusted with on average 668 mm (26.3 in) of rainfall per year, or 55.7 mm (2.2 in) per month. Edinburgh, Scotland is entrusted with on average 668 mm (26.3 in) of rainfall per year, or 55.7 mm (2.2 in) per month.