Environment Canada has issued a yellow heat warning for the London, Ontario area and surrounding regions of southwestern Ontario. The warning, announced on May 17, 2026, comes as temperatures are expected to climb significantly over the Victoria Day long weekend.
Heat Warning Details
The yellow warning indicates that hot and humid conditions are expected, posing potential health risks, particularly for vulnerable populations such as the elderly, young children, and those with pre-existing medical conditions. Residents are advised to stay hydrated, limit outdoor activities during peak heat hours, and check on neighbours and family members.
Regional Impact
The warning covers a broad area of southwestern Ontario, including London, and is part of a larger pattern of warm weather affecting the region. Local officials are reminding residents to never leave people or pets in parked vehicles and to seek cool environments such as air-conditioned public spaces.
In addition to the heat, the Victoria Day weekend is expected to bring sunny skies and high humidity, making conditions feel even warmer. Environment Canada continues to monitor the situation and may update the warning as conditions evolve.
