Active Weather Alerts
Yellow Warning - Heat
Issued: 8:10 PM Jul. 1, 2026 – Environment and Climate Change Canada
A multi-day heat event continues. What: Maximum temperatures of 28 to 33 degrees Celsius. Minimum temperatures of 17 to 21 degrees Celsius. Humidex values of 35 to 40. When: Continuing through Thursday, and into Friday for some regions in northeastern Ontario. Additional Information: This is the first heat event of the year for some regions. Heat will continue into Thursday, except into Friday for some regions over northeastern Ontario. Maximum temperatures of 28 to 33 degrees Celsius and humidex values of 36 to 40 are expected. Minimum temperatures of 17 to 21 degrees Celsius will provide little relief from the heat. 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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