Regions of southern Ontario are under a heat warning as “dangerously hot and humid” weather conditions are expected for most of the week, Environment Canada said.
“A prolonged heat event will begin today,” Environment Canada said in a special weather alert issued just before 6 a.m. Monday.
The multi-day heat event is expected to last until Thursday or Friday, the weather bureau said. The warning extends from Windsor across the Greater Toronto Area to Ottawa and north to Moosonee.
Environment Canada said daytime highs are expected to be between 30 and 35 degrees Celsius, with humidex values of 40 to 45.
There will be “little relief” overnight as minimum temperatures are expected to be 20C to 23C with humidex readings of 26 to 30.
However, the weather agency said temperatures and Humex readings could be several degrees cooler near the Great Lakes.
“Extreme heat can affect everyone’s health. Never leave people, especially children, or pets in a parked vehicle.”
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Environment Canada also said the heat wave could also lead to worsening air quality and cause the Air Quality Index to reach the high risk range.
The weather bureau warns to watch for signs of heat illness, such as swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
Those more at risk include older adults, infants and young children, pregnant people, people with physical and/or mental conditions, and people with disabilities or mobility problems.
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