Environment Canada is warning about heavy rains headed for the Hamilton area.

What it is calling a "significant widespread rainfall event" is expected overnight or early Tuesday morning.

Environment Canada says the Hamilton area can expect between 25 to 40 mm or rain, while some locations may see more than 60 mm.

The amounts of rain don't yet warrant status as a warning, but Environment Canada says it will monitor the system and may upgrade the statement if it looks like the rainfall amounts will exceed 50 mm more generally.

The weather statement extends from Windsor through Southern Ontario, into Eastern Ontario and Quebec.

Expect a mix of sun and cloud today with a high of 27 C.

(On mobile? Click here for weather updates.)