Forecasters at Environment Canada say it's going to be a wet end to the month of May for Londoners.
The national weather service has issued a special weather statement for London, Parkhill and Middlesex County.
Forecasters say a cold front will bring another 20 mm to 40 mm of rain with temperatures near 10 C.
This comes after a cold front brought rounds of scattered showers and thunderstorms to the region Saturday.