Environment Canada says a long-duration heat event will continue across Chatham-Kent through at least Friday, with the possibility of extending into the weekend.
An orange-level heat warning, issued at 4:45 a.m. Tuesday, remains in effect with a high impact level and very high forecast confidence.
Daytime highs are expected to range from 31 C to 34 C, with some areas potentially reaching 37 C. Overnight lows of 21 C to 25 C are expected to provide little relief from the heat.
Environment Canada said the hottest conditions are expected from Tuesday through Thursday, when maximum temperatures of 34 C to 37 C are forecast.
The agency also warned that hot and humid conditions could lead to deteriorating air quality, with the Air Quality Health Index potentially approaching the high-risk category.
Officials are urging residents to take precautions, noting that extreme heat can affect everyone’s health. People are encouraged to check on older adults, those living alone and other vulnerable individuals several times a day, either in person or by phone.
Environment Canada advises residents to watch for early signs of heat exhaustion, including headache, nausea, dizziness, thirst, dark urine and intense fatigue. Anyone experiencing those symptoms should stop their activity and drink water.
Heat stroke is a medical emergency, the agency said. Signs can include red and hot skin, dizziness, nausea, confusion and changes in consciousness. Anyone showing symptoms should receive immediate medical attention by calling 911 while efforts are made to cool the person by moving them to a cool place, removing excess clothing and applying cold water or ice packs.
Residents are also encouraged to drink water regularly, close blinds or shades during the day, use air conditioning or fans where available, and seek out cooler public spaces such as cooling centres, community centres, libraries or shaded parks if their homes become too hot.
Environment Canada recommends planning outdoor activities during the coolest parts of the day, limiting direct exposure to the sun, wearing lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat, and never leaving people or pets inside parked vehicles.
The heat warning remains in effect for Chatham-Kent. Residents are advised to continue monitoring forecasts and alerts issued by Environment Canada. Severe weather reports can be submitted by email to ONstorm@ec.gc.ca or by posting on X using the hashtag #ONStorm.
