Halton Region Public Health has issued an Extended Heat Warning starting June 30, 2026 for Halton Region as a result of Environment Canada issuing a Heat Warning for a multi-day heat event. An Extended Heat Warning is issued when the daytime temperatures are expected to reach at least 31 degrees Celsius with overnight temperatures above 20 degrees Celsius for three or more days, or when the humidex is expected to reach 40 for three or more days.
Take action to protect yourself and others – extreme heat can affect everyone’s health.
- 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.
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.
As the climate changes, heat events are expected to become more frequent, longer and hotter in Halton Region and other parts of Ontario.
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 (including individuals who have breathing difficulties, heart or kidney problems or are taking medication that affect their sensitivity to heat) in-person or on the phone multiple times a day and never leave people or pets in your care unattended in a car.
Weather and heat information are available on local radio and television stations and the Environment Canada Weather Conditions and Forecast webpage (external link). Also, check the Air Quality Health Index, air pollution tends to be higher during very hot days.
For information and tips on how to protect your health during Heat Warnings, including information on cooling centres, please visit our Preparing for Heat Events webpage at halton.ca or call 311.