Environment Canada has issued a heat warning for the region.
Hot and humid conditions are expected Saturday into Monday.
Temperatures reaching near 30 degrees Celsius with humidex values near 36 are expected over the next 3 days.
Overnight lows near 18 degrees Celsius will provide little relief from the heat.
The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
Drink plenty of water even before you feel thirsty and stay in a cool place.
Seek a cool place such as a tree-shaded area, swimming pool, shower or bath, or air-conditioned spot like a public building.
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.