Heat Warning for Southern Ontario

This alert expired on August 29, 2018 at 8:52:27 PM EDT
Environment Canada
Alert area: Simcoe - Delhi - Norfolk; Dunnville - Caledonia - Haldimand; Watford - Pinery Park - Eastern Lambton County; Sarnia - Petrolia - Western Lambton County; Chatham-Kent - Rondeau Park; Windsor - Leamington - Essex County; London - Parkhill - Eastern Middlesex County; Strathroy - Komoka - Western Middlesex County; St. Thomas - Aylmer - Eastern Elgin County; Rodney - Shedden - Western Elgin County; Woodstock - Tillsonburg - Oxford County; Brantford - County of Brant; City of Toronto; Uxbridge - Beaverton - Northern Durham Region; Newmarket - Georgina - Northern York Region; Pickering - Oshawa - Southern Durham Region; Vaughan - Richmond Hill - Markham; City of Hamilton; Guelph - Erin - Southern Wellington County; Kitchener - Cambridge - Region of Waterloo; Caledon; Mississauga - Brampton; Halton Hills - Milton; Burlington - Oakville; St. Catharines - Grimsby - Northern Niagara Region; Niagara Falls - Welland - Southern Niagara Region

Posted August 29, 2018 at 4:53:27 AM EDT

Humidex values reaching 40 are expected.

Hot and humid conditions will continue today.

A hot and humid airmass is expected to remain in place today. Maximum afternoon temperatures are expected to be near 30 degrees with humidex values near 40.

A cold front is expected to move through this afternoon bringing an end to the heat event.


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

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

Recommended actions

Drink plenty of water even before you feel thirsty and stay in a cool place.

Never leave people or pets inside a parked vehicle.

Is this page useful for you?
Let us know how it can be improved.

English (Canada)français (Canada)
You're seeing a basic version of this page. View an extended version with maps, news and more.
PrivacyHelp and FAQTerms of useFlag as inappropriate
© Google.org, 2021