Heat Warning Issued on Sept. 1 2026

Southwestern Public Health issues heat warnings when Environment Canada forecasts temperatures that are expected to be at least 31°C and overnight temperatures are at or above 20°C for two days or the Humidex is forecasted to be at least 40°C for two days.

Environment Canada is forecasting a heat event starting this afternoon and continuing into Wednesday September 2nd. Daytime highs will be as high as 32 degrees Celsius, with humidex values near 40. Overnight low temperatures are expected to be near 23 degrees Celsius.

During a heat warning, residents should take precautions to protect themselves and the most vulnerable from heat related illness. Those most vulnerable to the effects of the heat include older adults, infants and young children, outdoor workers, and homeless persons who do not have shelter, proper clothing or food. Anyone who experiences physical distress because of extreme temperatures should seek medical attention immediately, either by calling 911 or by going to the nearest emergency department.

What you should do:

• During extreme temperature conditions, stay indoors in an air-conditioned building if possible
• Limit time in the sun when the UV Index is most intense, between 11am - 4pm
• Seek shade when outdoors, especially during mid day
• Drink plenty of water to stay hydrated and decrease intake of caffeinated/alcoholic beverages
• Take cool showers or baths
• Apply Sunscreen with SPF 30 (or higher), 20-30 minutes before going outside to ensure absorption and re-apply every 2-3 hours
• Check regularly on children, elderly, persons with disabilities and individuals with chronic illnesses
• Never leave young children, elderly or pets in a closed parked vehicle for any period of time
• Find a local public Cooling Centre 
• Residents in Elgin County, Oxford County, and the City of St. Thomas are recommended to monitor the weather forecast to evaluate the risk of exposure to heat as conditions could change.
• Visit Environment Canada's website for the most up-to-date information.

Anyone who experiences physical distress because of extreme temperatures should seek medical attention immediately, either by calling 911 or by going to the nearest emergency department.