Ontario Heat Warning: Help Seniors, Infants, and Pets During This Intense Multi-Day Heat Event
- Small Town Productions
- Aug 9
- 4 min read
Environment Canada has issued a multi-day heat warning across Ontario, with daytime temperatures reaching 30 to 35°C and humidex values climbing between 35 and 40. Overnight lows will remain high, between 19 and 22°C, offering little relief from the heat.
This prolonged period of extreme heat can pose serious health risks, especially to vulnerable populations such as older adults, infants and young children, and pets.
Why Vulnerable Groups Are at Greater Risk
Older adults often have reduced ability to regulate body temperature and may be more susceptible to heat exhaustion and heat stroke. Infants and young children can overheat quickly and require constant care to stay cool and hydrated.
Pets are vulnerable to heatstroke and dehydration and should never be left unattended in vehicles or hot environments.
If you have elderly relatives or neighbors, infants, or pets, check on them frequently in person or by phone and ensure they have access to cool, shaded spaces and plenty of fluids.
Areas Under Heat Warning in Ontario
The following 93 communities are currently under the heat warning issued by Environment Canada:
Apsley – Woodview – Northern Peterborough County
Bancroft – Hastings Highlands – Denbigh
Barrie – Collingwood – Hillsdale
Barry's Bay – Killaloe
Bayfield Inlet – Dunchurch
Belleville – Quinte West – Eastern Northumberland County
Blind River – Thessalon
Bracebridge – Gravenhurst
Brantford – County of Brant
Brockville – Prescott
Bruce Peninsula – Sauble Beach – Tobermory
Burlington – Oakville
Caledon
Chatham-Kent – Rondeau Park
City of Hamilton
City of Toronto
Cobourg – Colborne – Western Northumberland County
Cornwall – Lancaster
Deep River – Whitney – Eastern Algonquin Park
Dunnville – Caledonia – Haldimand
Elliot Lake – Ranger Lake
Espanola – Killarney
Fenelon Falls – Balsam Lake Park – Northern Kawartha Lakes
Fraserdale – Pledger Lake
Gananoque – Mallorytown
Geraldton – Longlac – Caramat
Goderich – Bluewater – Southern Huron County
Gogama – Foleyet
Greater Sudbury and vicinity
Guelph – Erin – Southern Wellington County
Haliburton – Minden – Southern Haliburton County
Halton Hills – Milton
Hanover – Dundalk – Southern Grey County
Huntsville – Baysville
Innisfil – New Tecumseth – Angus
Kaladar – Bannockburn – Bon Echo Park
Kingston – Odessa – Frontenac Islands
Kirkland Lake – Englehart
Kitchener – Cambridge – Region of Waterloo
Lindsay – Southern Kawartha Lakes
Listowel – Milverton – Northern Perth County
London – Parkhill – Eastern Middlesex County
Manitoulin Island
Maxville – Alexandria
Merrickville-Wolford – Kemptville
Midland – Coldwater – Orr Lake
Mississauga – Brampton
Moosonee
Morrisburg – Long Sault
Mount Forest – Arthur – Northern Wellington County
Napanee – Consecon
Newmarket – Georgina – Northern York Region
Niagara Falls – Welland – Southern Niagara Region
North Bay – Powassan – Mattawa
Orangeville – Grand Valley – Southern Dufferin County
Orillia – Lagoon City – Washago
Ottawa North – Kanata – Orléans
Ottawa South – Richmond – Metcalfe
Owen Sound – Blue Mountains – Northern Grey County
Oxtongue Lake – Fort Irwin – Northern Haliburton County
Petawawa – Pembroke – Cobden
Peterborough City – Lakefield – Southern Peterborough County
Pickering – Oshawa – Southern Durham Region
Picton – Sandbanks Park
Plevna – Sharbot Lake – Western Lanark County
Port Carling – Port Severn
Prescott and Russell
Renfrew – Arnprior – Calabogie
Rodney – Shedden – Western Elgin County
Sarnia – Petrolia – Western Lambton County
Saugeen Shores – Kincardine – Southern Bruce County
Shelburne – Mansfield – Northern Dufferin County
Simcoe – Delhi – Norfolk
Smiths Falls – Perth – Eastern Lanark County
South River – Burk's Falls
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
Temiskaming Shores – Temagami
Town of Parry Sound – Rosseau – Killbear Park
Uxbridge – Beaverton – Northern Durham Region
Vaughan – Richmond Hill – Markham
Watford – Pinery Park – Eastern Lambton County
West Nipissing – French River
Western Algonquin Park – Lake of Two Rivers
Westport – Charleston Lake
Winchester – Newington
Windsor – Leamington – Essex County
Wingham – Blyth – Northern Huron County
Woodstock – Tillsonburg – Oxford County
Signs of Heat-Related Illness
Heat Exhaustion: headache, dizziness, nausea, thirst, dark urine, and extreme fatigue. If these symptoms appear, stop activity immediately, move to a cooler place, and drink water.
Heat Stroke: hot, red, dry skin, confusion, nausea, and loss of consciousness. This is a medical emergency. Call 911 immediately. While waiting for help, move the person to a cooler place, remove excess clothing, and apply cool water or ice packs.
How to Protect Yourself and Others
Drink water regularly even if you don’t feel thirsty.
Avoid strenuous outdoor activity during peak heat hours usually between 11 a.m. and 7 p.m.
Use air conditioning, fans, or visit public cooling centres, libraries, or community centres.
Keep blinds and curtains closed during the day to block out heat.
Wear lightweight, loose-fitting, light-coloured clothing and a wide-brimmed hat when outdoors.
Check on seniors, infants, children, and pets frequently to ensure they are cool and hydrated.
Never leave children or pets unattended in vehicles.
Help Others Stay Informed
You can help protect your community by sharing this information with family, friends, and neighbors, especially those who may be more vulnerable to heat. Encourage others to monitor weather updates from Environment Canada and local public health authorities.
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