Durham Region Health Department Advises Residents to Prepare for First Heat Event of 2025

Residents in north and south Durham Region have been advised by the Durham Region Health Department to prepare for a potential multi-day heat event starting this weekend. The department states that forecasts indicate temperatures are expected to meet criteria for a heat warning, marking the first such event in the area for 2025.

According to the Health Department, extreme heat may continue into the following week. Environment and Climate Change Canada issues a heat warning when daytime highs reach at least 31°C with overnight temperatures of 20°C or more, or when humidex values of 40 or higher are expected for two days or more. Humidex describes how hot the weather feels, combining temperature and humidity.

The Health Department notes that health risks from extreme heat can affect everyone, but infants, young children, and adults over 60 years old are at greater risk. Additional higher-risk groups include individuals who are pregnant, live alone, take certain medications, do not have secure housing, have existing health conditions or limited mobility, have limited resources, or who work or exercise outside. The department recommends that people taking medication or living with health conditions consult a doctor or pharmacist about possible increased risks during hot weather.

Symptoms of heat-related illness, as identified by the Health Department, include dizziness or fainting, swelling of hands, feet, or ankles, nausea or vomiting, headache, rapid breathing or heartbeat, extreme thirst or fatigue, and changes in behaviour such as sleepiness or temper tantrums in children.

The department states that heatstroke is the most serious heat-related illness. Signs may include confusion, a body temperature above 39°C (102°F), or partial or complete loss of consciousness. If these symptoms are present, the department urges calling 911, moving the person to a cool place, and using wet towels, clothing, or icepacks on the neck, armpits, and groin while waiting for emergency assistance.

The Health Department recommends the following precautions to prevent heat-related illness:

• Drink water regularly, without waiting to feel thirsty
• Layer damp towels on the body or mist with water
• Take cool showers or place feet in cool water
• Rest and limit physical activity
• Spend time in a cool place
• Block out the sun with awnings, curtains, or blinds during the day
• Avoid sun exposure by using shade or wearing a wide-brimmed, breathable hat or using an umbrella
• Plan outdoor activities for cooler parts of the day
• Open windows at night if the outside temperature is lower
• Never leave people or pets inside parked vehicles

The Health Department will post updates and resources regarding heat warnings at durham.ca/Heat and on its social media channels. For further information, residents can also check updates from Environment and Climate Change Canada or visit the Health Department website.