Active Weather Alerts
Heat Warning
Issued: 9:12 PM Jun. 22, 2025 – Environment and Climate Change Canada
Dangerous heat and humidity will continue through early to mid week. The first significant heat event of the season with dangerously hot and humid conditions is expected to continue into the week. What: Daytime highs of 33 to 36 degrees Celsius. Humidex values of 42 to 46. Overnight lows of 22 to 25 degrees Celsius, providing little relief from the heat. When: Now until Tuesday night. Additional information: The extreme heat and humidity may continue into Wednesday. A cold front is expected to push through the region late Tuesday, but there is some uncertainty with how far south this front will get. Should it remain farther north, the heat event may continue Wednesday, primarily for southwestern Ontario and the GTA. ### 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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