The weather service said that although temperatures will ease slightly from highs over the weekend, lingering humidity will keep things muggy and warm until at least Tuesday.
The actual forecast temperature in Toronto is expected to reach 28C this afternoon, with possible thunderstorms throughout the day.
Better weather is expected to arrive in the area on Tuesday.
The heat means everyone needs to drink plenty of water even when they don’t feel thirsty.
Those working outdoors should take frequent breaks, and the elderly and young children should limit outdoor activity.
