Issued: 1:59 PM EDT Monday 20 June 2022 by Environment Canada
NOTE: There is a separate Heat Warning in effect for Chatham-Kent and Windsor-Essex. For more details, click here.
Heat Warning issued for:
Brantford - County of Brant
Burlington - Oakville
Caledon
City of Hamilton
City of Toronto
Dunnville - Caledonia - Haldimand
Goderich - Bluewater - Southern Huron County
Guelph - Erin - Southern Wellington County
Halton Hills - Milton
Hanover - Dundalk - Southern Grey County
Innisfil - New Tecumseth - Angus
Kitchener - Cambridge - Region of Waterloo
Listowel - Milverton - Northern Perth County
London - Parkhill - Eastern Middlesex County
Mississauga - Brampton
Mount Forest - Arthur - Northern Wellington County
Newmarket - Georgina - Northern York Region
Niagara Falls - Welland - Southern Niagara Region
Orangeville - Grand Valley - Southern Dufferin County
Pickering - Oshawa - Southern Durham Region
Rodney - Shedden - Western Elgin County
Sarnia - Petrolia - Western Lambton County
Saugeen Shores - Kincardine - Southern Bruce County
Shelburne - Mansfield - Northern Dufferin County
Simcoe - Delhi - Norfolk
St. Catharines - Grimsby - Northern Niagara Region
St. Thomas - Aylmer - Eastern Elgin County
Stratford - Mitchell - Southern Perth County
Strathroy - Komoka - Western Middlesex County
Uxbridge - Beaverton - Northern Durham Region
Vaughan - Richmond Hill - Markham
Watford - Pinery Park - Eastern Lambton County
Wingham - Blyth - Northern Huron County
Woodstock - Tillsonburg - Oxford County
A two day heat event is forecast for Tuesday through Wednesday. Temperatures on both Tuesday and Wednesday will reach the low to possibly mid thirties (degrees Celsius). Temperatures Tuesday night and Wednesday night in the low twenties (degrees Celsius) will provide little relief from the heat. Cooler air is expected to arrive by Thursday. Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category.
The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
Never leave people or pets inside a parked vehicle.
When it's hot eat cool, light meals.
Outdoor workers should take regularly scheduled breaks in a cool place.