The GTA is under a heat warning that could see humidex values climb into the 40s this weekend.

Environment Canada says the multi-day heat event is scheduled to begin on Saturday, where daytime highs are forecast to be between 30 and 33 degrees C with humidex values between 35 and 40.

The national weather service says there won’t be much relief from the heat at night with lows ranging between 19 and 23 C.

“The hottest days of this heat wave are expected to be Sunday and Monday with highs between 33 to 34 degrees, and I wouldn’t be surprised if a couple of spots outside of the city and away from the cooling effects of Lake Ontario hit 35 or 36 degrees,” says CityNews Chief Meteorologist Natasha Ramsahai.

“The humidity remains moderate right now with humidex values into the mid to high 30

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