Active Weather Alerts
Yellow Warning - Heat
Issued: 8:52 AM 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 of 30 to 32 degrees Celsius. Humidex values of 36 to 38. Overnight lows near 20 degrees Celsius. When: Beginning this afternoon and continuing into Tuesday. Ending Tuesday night. Additional Information: ### 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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