Below is a heat and humidity warning from Environment Canada issued shortly before midnight Sunday.
Humidex values reaching 40 are expected.
A heat event continues through Monday.
Daytime maximum values of 31 degrees or higher are expected Monday with humidex values near 40. Overnight minimum temperatures will only fall to near 20 degrees, except 22 to 24 over some urban areas, providing little relief from the heat.
A cold front is expected to to move through the area Tuesday bringing an end to this event.
Extreme heat affects everyone.
The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
Never leave people or pets inside a parked vehicle.
Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.