Toronto is getting hit with a second July heat wave, and it could feel like 45°C, Canada Reviews

Toronto only recently escaped its first major heat wave of July, and another round of sweltering weather is already here.

Environment and Climate Change Canada issued a yellow heat warning for Toronto this morning, meaning the heat could lead to moderate and short-term disruptions or health impacts.

The heat wave is expected to bring daytime temperatures between 30°C and 37°C across affected parts of southern Ontario, while humidex values could make it feel more like 38°C to 45°C. Overnight temperatures will remain between 20°C and 24°C, so little relief to anyone trying to sleep without AC.

In Toronto, Monday is forecast to be sunny with a high of 33°C and a humidex of 38, followed by an overnight low of 22°C.

Tuesday gets even sweatier and is expected to be the hottest day of the heat wave! Toronto could reach 37°C, with the humidex making it feel like 45°C. The temperature is only expected to drop to 24°C overnight.

Conditions should improve a bit by either Wednesday evening or Thursday evening, depending on the area. Toronto is still forecast to reach 33°C on Wednesday, with a 30 per cent chance of showers, before the overnight low dips to 19°C. Thursday will remain hot, with a forecast high of 31°C, but the temperature is thankfully expected to fall to a much more manageable 17°C overnight.

Friday will bring the biggest relief of the week, with a high of 28°C.

This is the second significant heat wave to hit Toronto this month. Heat warnings blanketed southern Ontario over Canada Day, when humidex values reached the mid-to-upper 40s in some areas.

To prevent heat stroke, Environment Canada is reminding people to drink water regularly, even before feeling thirsty, and to move outdoor activities to the coolest parts of the day wherever possible.

“Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water,” the agency warned.

For more inspo, check out these 25 ways to beat the heat in Toronto this summer.