Active Weather Alerts
Heat Warning
Issued: 8:43 AM Jul. 15, 2025 – Environment and Climate Change Canada
A prolonged period of extreme heat and humidity continues. What: Daytime highs of 31 to 35 degrees Celsius and a humidex of 37 to 42. Overnight lows of 19 to 23 degrees Celsius, providing little relief from the heat. When: Continuing through to Thursday night. Additional information: Southern Ontario will experience hot and humid conditions now through much of this week. A shift in the weather pattern late this week will likely end this multi-day period of heat and humidity Thursday night. ### 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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