NOTE: This alert is currently region-specific. To view the Heat Warning for other regions, use the links below.
Issued: 3:05 PM EDT Monday 18 July 2022 by Environment Canada
Heat Warning issued for:
Apsley - Woodview - Northern Peterborough County
Bancroft - Hastings Highlands - Denbigh
Barrie - Collingwood - Hillsdale
Barry's Bay - Killaloe
Belleville - Quinte West - Eastern Northumberland County
Brantford - County of Brant
Brockville - Prescott
Burlington - Oakville
Caledon
City of Hamilton
City of Toronto
Cobourg - Colborne - Western Northumberland County
Cornwall - Lancaster
Dunnville - Caledonia - Haldimand
Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes
Gananoque - Mallorytown
Goderich - Bluewater - Southern Huron County
Guelph - Erin - Southern Wellington County
Halton Hills - Milton
Hanover - Dundalk - Southern Grey County
Kaladar - Bannockburn - Bon Echo Park
Kitchener - Cambridge - Region of Waterloo
Lindsay - Southern Kawartha Lakes
Listowel - Milverton - Northern Perth County
London - Parkhill - Eastern Middlesex County
Maxville - Alexandria
Merrickville-Wolford - Kemptville
Mississauga - Brampton
Morrisburg - Long Sault
Mount Forest - Arthur - Northern Wellington County
Newmarket - Georgina - Northern York Region
Niagara Falls - Welland - Southern Niagara Region
Orillia - Lagoon City - Washago
Ottawa North - Kanata - Orléans
Ottawa South - Richmond - Metcalfe
Petawawa - Pembroke - Cobden
Peterborough City - Lakefield - Southern Peterborough County
Pickering - Oshawa - Southern Durham Region
Plevna - Sharbot Lake - Western Lanark County
Prescott and Russell
Renfrew - Arnprior - Calabogie
Rodney - Shedden - Western Elgin County
Simcoe - Delhi - Norfolk
Smiths Falls - Perth - Eastern Lanark County
St. Catharines - Grimsby - Northern Niagara Region
St. Thomas - Aylmer - Eastern Elgin County
Stirling - Tweed - Madoc
Stratford - Mitchell - Southern Perth County
Strathroy - Komoka - Western Middlesex County
Tamworth - Sydenham - South Frontenac
Uxbridge - Beaverton - Northern Durham Region
Vaughan - Richmond Hill - Markham
Westport - Charleston Lake
Winchester - Newington
Wingham - Blyth - Northern Huron County
Woodstock - Tillsonburg - Oxford County
Hot and humid conditions are expected Tuesday and Wednesday. Daytime high temperatures reaching near 31 degrees Celsius with humidex values in the upper thirties are expected Tuesday and Wednesday. Tuesday's overnight low near 20 degrees Celsius will provide little relief from the heat. Slightly cooler temperatures are expected on 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.
Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions. Seek a cool place such as a tree-shaded area, swimming pool, shower or bath, or air-conditioned spot like a public building. Never leave people or pets inside a parked vehicle. Watch for the symptoms of heat illness: dizziness/fainting; nausea/vomiting; rapid breathing and heartbeat; extreme thirst; decreased urination with unusually dark urine. Keep your house cool. Block the sun by closing curtains or blinds.
