Walden Place, ON

11:01 AM EDT Wednesday 16 July 2025

A prolonged period of hot and humidity continues. What: Daytime highs of 31 to 34 degrees Celsius and a humidex of 37 to 42. Overnight lows of 19 to 21 degrees Celsius, providing little relief from the heat. When: Continuing through Thursday. Additional information: Showers and thunderstorms moving through Thursday morning are expected to keep daytime temperatures relatively cooler for most regions, bringing an end to the heat event. For regions not affected by showers, a cooler airmass will bring an end to the event by Thursday night. Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day. Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body. Drink water often and before you feel thirsty to replace fluids. Close blinds, or shades and open windows if outside is cooler than inside. Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. Follow the advice of your region’s public health authority. Plan and schedule outdoor activities during the coolest parts of the day. Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind. For more information: How to protect yourself from the health effects of extreme heat Health risks and who is at risk of extreme heat events 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.