Heat warnings have been issued for parts of Alberta and British Columbia, bringing the total number in effect across Canada to 110.
Overnight temperatures are only expected to fall between 20 C and 24 C, providing minimal relief from the heat.
Daytime highs of 32c or higher are expected on Monday, with humidex values reaching the low forties.
High temperatures mean big health risk for young children, pregnant women, the elderly, people with chronic diseases and those who work outdoors.
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In addition to swimming pools, beaches and air-conditioned shopping malls, Toronto has 180 air-conditioned community centres and local libraries in neighbourhoods across the city.
Never leave people or pets inside a parked vehicle.
The weather service warns that high temperatures and humid conditions increases the possibility of getting a heat stroke or heat exhaustion.
In southern Ontario and Quebec, the humidex is also likely to hit the low 40s today, however, forecasters say cooler air is expected to move into parts of Ontario this evening, bringing an end to what has been a almost weeklong heat event.