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Yellow Warning - Heat
Issued: 8:41 PM Jul. 1, 2026 – Environment and Climate Change Canada
A long duration heat event continues. This is the first heat event of the season. What: Maximum temperatures of 30 to 33 degrees Celsius. Minimum temperatures of 20 to 23 degrees Celsius. Humidex values of 38 to 42. When: Continuing through Friday. Additional Information: The hottest conditions are expected to continue into Thursday, with maximum temperatures potentially reaching 34 degrees Celsius. Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high-risk category. ### Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion. 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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