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Dangerous heat and humidity in region is expected to continue into next weekRochelle Raveendran · CBC News · Posted: Jun 21, 2025 12:17 PM EDT | Last Updated: June 21Daytime highs could reach 36 C in the Greater Toronto Area on Sunday afternoon, Environment Canada said. Extreme heat is expected to continue in the region until Tuesday night. (Evan Mitsui/CBC)Social SharingEnvironment Canada has placed the Greater Toronto Area and surrounding cities under a heat warning, saying dangerously hot and humid conditions will begin Sunday afternoon and continue into next week. Daytime highs are expected between 31 and 36 C. Humidex values, which reflect how hot it feels, may range between 40 and 45, Environment Canada said. Overnight lows are forecast between 21 and 25 C, which the weather agency said will provide "little relief from the heat." The warning is in effect for the following areas: Toronto, Mississauga, Brampton, Richmond Hill, Vaughan, Markham, Newmarket, Georgina, northern York Region, Durham Region, Pickering, Oshawa, Uxbridge, Beaverton, Simcoe, Halton Hills, Milton, Barrie, Collingwood and Hillsdale. WATCH | Environment Canada senior climatologist discusses the heat wave heading for the GTA: What you need to know about the heat wave headed for Toronto2 days agoDuration 4:02A senior climatologist with Environment Canada has the details on extreme heat headed for Toronto — and how the city’s summer forecast is shaping up. Extreme heat is expected to continue until Tuesday night. It may continue Wednesday for southwestern Ontario and the GTA, depending on the movement of an expected cold front. "I am urging all residents to stay cool, drink lots of water and look after each other," Toronto Mayor Olivia Chow said Saturday at an unrelated city news conference. People are advised to watch for symptoms of heat stroke, which is a medical emergency, in themselves and others. Symptoms can include red and hot skin, dizziness, nausea, confusion and change in consciousness. "While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body," Environment Canada advised. Extreme heat in store for Toronto with temperatures that may prompt warningToronto's getting hotter. Experts say a chief heat officer could help the city adaptThe weather agency also advised people to drink water often, even before feeling thirsty, and close blinds and open windows if the outside is cooler than inside. "If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park," the heat warning says. People are also advised to check in regularly on those at greater risk of heat illness, including the elderly and those living alone. Signs of heat exhaustion may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. If you experience these symptoms, Environment Canada advises stopping your activity and drinking water. When going outside, people are advised to limit exposure to sun and heat by planning activities during the coolest parts of the day and wearing lightweight, light-coloured, loose fitting clothing. City of Toronto pools set extended weekend hoursThe City of Toronto's 58 outdoor pools will have extended hours this weekend, staying open from 10 a.m. to 8 p.m., the city said in a news release Saturday.While the heat warning is in effect, the following pools will be open until 11: 45 p.m. daily: Alex Duff Pool, 779 Crawford St. Giovanni Caboto Pool, 1367 St. Clair Ave. W. Sunnyside Park/Gus Ryder Pool, 1755 Lake Shore Blvd. W. McGregor Park, 2231 Lawrence Ave. E. North Toronto Outdoor Pool, 200 Eglinton Ave W. Smithfield Park, 175 Mount Olive Dr. Monarch Park, 115 Felstead Ave. Halbert Pool, 24 Rockwood Dr. (open until 9 p.m. only) The city's splash pads will operate daily from 9 a.m. to 9 p.m. and 15 wading pools will be open this weekend from 12 p.m. to 5 p.m.There are more than 500 cool spaces across the city — including libraries, community centres and pools — where people can find relief during the extreme heat. A full list of cool spaces is available on the city's . Apartments are allowed to be dangerously hot in Toronto. City still studying optionsThe city said it will also conduct enhanced outreach efforts to people experiencing homelessness, including through referrals to shelters and distributing water bottles. It said it will deliver 14,000 water bottles to outreach staff on Saturday.Additional staff will focus exclusively on distributing water bottles to people experiencing homelessness, including those in encampments. On Sunday, three of the city's HTO To Go water trailers, which provide free tap water, will be located at Nathan Phillips Square, Trinity Bellwoods Park and Sankofa Square, Chow said. ABOUT THE AUTHORRochelle RaveendranRochelle Raveendran is a reporter for CBC News Toronto. She can be reached at: rochelle.raveendran@cbc.ca. ·Corrections and clarifications·Submit a news tip·Report errorRelated Stories Extreme heat in store for Toronto with temperatures that may prompt warning Dangerous heat to hit eastern Ontario Sunday afternoon, Environment Canada warns Environment Canada warns of extreme heat for Windsor-Essex, Chatham, Sarnia areas Sweltering temperatures expected as heat warnings issued for most of Alberta Quebec to see scorching temperatures to start the week, says Environment CanadaFooter LinksMy AccountProfileAbout CBC AccountsConnect with CBCPodcastsContact CBCAudience Relations, CBC P.O. Box 500 Station A Toronto, ON Canada, M5W 1E6 Toll-free (Canada only): 1-866-306-4636About CBCSitemapPrivacy PreferencesServicesAccessibilityIt is a priority for CBC to create products that are accessible to all in Canada including people with visual, hearing, motor and cognitive challenges.Closed Captioning and Described Video is available for many CBC shows offered on .About CBC AccessibilityAccessibility Feedback©2025 CBC/Radio-Canada. All rights reserved. now, Environment Canada has placed the Greater Toronto Area and surrounding cities under a heat warning, saying dangerously hot and humid conditions will begin Sunday afternoon and continue into next week., Dangerous heat and humidity beginning Sunday afternoon. The first significant heat event of the season with dangerously hot and humid conditions will begin Sunday afternoon and is expected to continue into the week. What: Daytime highs of 31 to 36 degrees Celsius. Humidex values of 40 to 45..