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Heat warning could be in place for a few days

With the humidex, it will feel closer to 40
071919-water bottle-hot-heat wave-AdobeStock_257992792
(stock photo)

4:49 AM EDT Monday 23 August 2021
Heat Warning in effect for:

  • Guelph - Erin - Southern Wellington County
  • Kitchener - Cambridge - Region of Waterloo
  • Mount Forest - Arthur - Northern Wellington County

Heat and humidity expected to continue today and possibly into the middle of this week.

Daytime maximum temperatures: 30 to 32 degrees Celsius, with humidex values 37 to 40.

Nighttime minimum temperatures: near 21 degrees Celsius.

Hot and humid air can also bring deteriorating air quality and can cause the Air Quality Health Index to approach the high risk category.

Extreme heat affects everyone.

The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.

Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.

Never leave people or pets inside a parked vehicle.

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.


A list of cooling centres in Waterloo Region can be found here.

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