A heat warning remains in place for Toronto as hot and humid conditions continued on Sunday.
Environment Canada said the sweltering weather will likely persist into the work week.
A high temperature of 31 C is expected, with humidex values that will make it feel like between 36 and 40. The low temperature on Sunday night is forecast to be 19 C.
The Air Quality Health Index can reach a high risk category and the hot and humid air means air quality can deteriorate, Environment Canada said.
In Toronto, the city is continuing to extended its pool hours. Outdoor pools will be open until 11:45 p.m. on Sunday at eight locations, including:
Alex Duff Pool
Alexandra Park Pool
Giovanni Caboto Pool
Sunnyside Park Pool
The federal weather agency recommends drinking lots of water before you feel thirsty and finding cool places. People are reminded not to leave people or pets in parked cars.