The low-pressure weather system is predicted to bring 20 to 40 mm of intense rain which could cause river and roadway flooding.
Toronto and Region Conservation Authority said bodies of water within the GTA should be avoided as the slippery and unstable conditions are considered hazardous.
Special weather statement in effect for #RichmondHill. Significant ☔️ likely today and tonight with a risk of a thunderstorm ⛈ this evening.
Localized ponding in low-lying areas and on roads is possible…so be careful! #aprilshowers pic.twitter.com/n6jrxa4tAs
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.