Environment Canada has issued a heat warning for most of Durham and York regions, as well as Kawartha Lakes.
Daytime high temperatures in excess of 30 degrees Celsius – with humidex values in the high 30s to low 40s – are expected until at least Sunday, and likely beyond.
“Overnight lows in excess of 20 degrees Celsius are also expected through this period, providing little relief from the heat,”
Residents are encouraged to watch for the symptoms of heat illness – dizziness/fainting; nausea/vomiting; rapid breathing and heartbeat; extreme thirst; decreased urination with unusually dark urine.
“Extreme heat affects everyone,” the warning reads.
“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.”