Rainfall Warning Ontario 2025 Rainfall Warning. Environment canada issues rainfall warning for wide swath of ontario for sunday, dec. Pwat values on sunday are forecast to exceed 30 mm, which is incredibly rare for this time of.

On sunday the effect of another approaching low pressure system will result in 20 to 30 mm of rainfall in the southern region and less than 10 mm elsewhere in the forecast. There is no active rainfall warning.