Hot and humid conditions to persist into tomorrow.
Niagara remains under a heat warning.
Environment Canada says hot and humid conditions will occur into tomorrow.
Beginning this afternoon, daytime highs are expected to range between 30 and 33 degrees, with humidex values around 40.
Overnight temperatures will be between 20 and 22 degrees, providing little relief.
Areas that receive showers and thunderstorms tomorrow may get slightly cooler temperatures.
Conditions are expected to improve tomorrow night.
Extreme heat is particularly risky for pregnant women, senior citizens, young children, people with chronic illnesses and anyone who works or exercises outdoors.
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