The federal weather agency says rain will be heaviest most likely early this evening and there is risk of a thunderstorm.
Toronto to see significant rainfall as Environment Canada issues special weather statement
A low pressure system that is moving over the Toronto area on Sunday morning is bringing the precipitation.
Environment Canada is forecasting as much as 20-40 mm of rain for the region and has issued a special weather statement for Toronto and much of the province.
Rain associated with an approaching low pressure system will move into the area this morning. The heaviest rain is expected early this evening along with the risk of a thunderstorm, Environment Canada said in its statement.
The highest rainfall amounts are likely to occur over Niagara and areas east of Toronto, the weather agency said.
The temperature is expected to rise next week. A high of 8 C is expected Monday, going up to 13 C by Wednesday.