Active Weather Alerts
Yellow Warning - Heat
Issued: 2:53 PM May. 18, 2026 – Environment and Climate Change Canada
The first heat event of the season will begin this afternoon and is expected to continue into Tuesday. What: Daytime highs near 30 degrees Celsius. Humidex values near 36. Overnight lows of 18 to 20 degrees Celsius. When: Beginning this afternoon and continuing into Tuesday. Ending Tuesday night. Additional Information: Temperatures may be cooler along the lake shores. ### 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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