The first major heat event of the season is set to arrive in southern Ontario beginning Monday afternoon, bringing soaring temperatures, humid conditions, and warm overnight lows that could make conditions uncomfortable for millions of residents.

Environment Canada says the heat event is expected to continue through Tuesday before easing Tuesday night.

Daytime highs are forecast to reach near 30 C, while humidex values could make it feel closer to 36. Overnight temperatures are also expected to remain unusually warm, with lows between 18 and 20 C offering little relief from the heat.

The heat warning covers a large stretch of southern Ontario, including Toronto, Mississauga, Brampton, Oakville, Milton, Burlington, Hamilton and the Niagara Region.

Officials are urging residents to take precautions, as extreme heat can affect anyone’s health, especially older adults, young children, people living alone, and those with underlying health conditions.

Health experts warn residents to watch for signs of heat exhaustion, which can include headaches, dizziness, nausea, intense fatigue, thirst and dark urine. Anyone experiencing symptoms is advised to stop activity immediately and drink water.

Heat stroke is considered a medical emergency. Symptoms can include red or hot skin, confusion, dizziness, nausea and loss of consciousness. Residents are urged to call 911 if someone shows signs of heat stroke and attempt to cool the person while waiting for emergency crews.

People are encouraged to drink water frequently, keep blinds or curtains closed during the hottest parts of the day and use air conditioning or fans when possible. Those without access to cooling are advised to visit public spaces such as libraries, community centres, cooling centres or shaded parks.

Environment Canada is also reminding residents to limit direct exposure to the sun, wear lightweight and light-coloured clothing and schedule outdoor activities during cooler morning or evening hours.

Officials are also stressing that children, pets and vulnerable individuals should never be left inside parked vehicles, even for a short period of time.


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