Active Weather Alerts
Yellow Warning - Heat
Issued: 9:22 AM Jul. 13, 2026 – Environment and Climate Change Canada
A heat event begins today. What: Maximum temperatures of 30 to 37 degrees Celsius. Minimum temperatures of 20 to 24 degrees Celsius. Humidex values of 38 to 45. When: Beginning today and ending either Wednesday evening or Thursday evening. Additional information: Tuesday will mark the peak of this heat event. Maximum temperatures on Tuesday near 37 degrees Celsius are expected for some areas over southwestern Ontario, around the Greater Golden Horseshoe and eastern Ontario. Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high-risk category. ### For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.
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