Southern Ontario is bracing for an extended period of hot and increasingly humid weather starting Monday, with temperatures expected to reach their peak midweek and continue through the Canada Day holiday into early July.
According to Environment Canada’s forecast, daytime highs will rise steadily across the Greater Toronto and Hamilton Area, which includes Mississauga, Toronto, Brampton, Hamilton, Oshawa, and Pickering. A multi-day heat event is projected from June 29 through at least July 4.
The hot spell kicks off on Monday (June 29), with daytime temperatures around 28°C in Toronto, Mississauga, and Brampton. Humidity will start to build up, pushing humidex values into the low 30s, making it feel significantly warmer than what the thermometer indicates.
Overnight lows near 20°C will also keep things warm and sticky, limiting any relief after dark.
The peak of the heatwave is set to arrive on Tuesday and Wednesday when daytime highs climb into the low to mid-30s across much of the region.
Toronto: near 33°C Mississauga / Brampton: around 35°C Hamilton: similar mid-30s inland heat Oshawa / Pickering: 32°C, slightly moderated by Lake Ontario Niagara Region: 32°C with humidity driving it even higher
When factoring in humidity, humidex values are expected to hit the upper 30s and may approach 40 degrees, especially in urban areas like Brampton and parts of the GTA.
These conditions fall under extreme heat risk criteria-particularly where overnight lows hover around 22°C to 24°C-which prevents significant cooling down during night hours.
On Canada Day (Wednesday, July 1), southern Ontario is likely to remain under intense heat with highs ranging from near 33°C to about 35°C throughout most of the GTA and nearby areas.
Humidity will again make it feel more like the upper 30s; conditions might be uncomfortable during outdoor events such as barbecues or fireworks displays.
There’s also a possibility of scattered showers or thunderstorms developing on Canada Day during the afternoon and evening-a typical occurrence in high-heat situations. Any storms that form could bring brief heavy rainfalls along with gusty winds and small hail; however, widespread severe weather isn’t guaranteed at this point.
From Thursday through Friday, expect continued warmth with highs generally between 32°C and 35°C. Some variation might occur based on cloud cover or thunderstorm activity.
There are periodic chances of showers or thunderstorms-ranging from about 30% to 40%-in the forecast for later this week. Localized storms could offer a brief break from heat but may also raise humidity levels afterwards.
Even at night, temperatures are set to stay warm-generally between 20°C and 24°C-resulting in limited overnight cooling opportunities especially in urban regions where heat tends to linger more strongly.
Health officials usually recommend residents take precautions during prolonged heat events:
Seek air-conditioned spaces such as libraries, malls or cooling centres Limit strenuous outdoor activities during peak afternoon heat Stay hydrated and check on vulnerable neighbors Use fans cautiously-they’re less effective when humidex climbs into high numbers Never leave children or pets in parked vehicles INsauga’s Editorial Standards and Policies
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