A chilly start, then summer heat returns to Toronto
This week in Toronto, an epic temperature swing is set to shake things up, with the city expected to shiver and sweat within just 72 hours. It’s a classic move from Toronto’s famously unpredictable climate — bizarre, extreme, and occasionally delightful.
Sunday, June 1: A cool start to the month
The first day of June, Sunday, will bring a chilly afternoon high of just 15°C (59°F), noticeably cooler than the seasonal average. By the evening, the mercury is forecast to drop to 8°C (46°F), feeling like 7°C (44.6°F). It’s a surprisingly brisk beginning to a month that, according to seasonal forecasts, should bring above-average warmth across Ontario.
Monday and Tuesday: Summer steps in
From Monday, June 2, the city starts to shift into summer gear. A sunny push will send the daily high to 19°C (66°F), and by Tuesday, temperatures will climb to 22°C (71.6°F), feeling like 24°C (75.2°F). The first three days of June will also feature a low chance of precipitation — only up to 20%, making it the perfect window for outdoor time in spots like Trinity Bellwoods Park.
Wednesday, June 4: Heat and humidity peak
By Wednesday, June 4, the city is expected to sizzle, with an afternoon high of 25°C (77°F) and a humidex of 30°C (86°F). These sticky conditions may break in the evening with a chance of thunderstorms and a slight temperature drop to 21°C (69.8°F).
Later in the week: Consistent warmth on the horizon
The outlook for the remainder of the week shows mid-20s highs, hinting at a return to stable summer weather. The first heat wave of the season is likely to hit around the Canada Day long weekend, marking the beginning of what could be a long, hot summer across Ontario — one that might have residents scrambling for shade and cold relief.
