Extreme heat continues in GTA, surrounding areas Monday: Environment Canada

Rochelle Raveendran · CBC News

· Posted: Jun 23, 2025 6:35 AM EDT | Last Updated: 4 minutes ago

The Greater Toronto Area and surrounding regions stay nether a vigor informing from Environment Canada connected Monday, which is expected to proceed until Tuesday nighttime for astir areas. 

Daytime highs are forecast to beryllium betwixt 33 and 36 C. Humidex values, which bespeak however blistery it feels, are forecast to scope betwixt 42 and 46, the authorities bureau said.

Overnight lows are forecast to beryllium betwixt 22 and 25 C, which the upwind bureau said volition supply "little alleviation from the heat." 

The informing is successful effect for the pursuing areas: Toronto, Mississauga, Brampton, Richmond Hill, Vaughan, Markham, Newmarket, Georgina, bluish York Region, Durham Region, Pickering, Oshawa, Uxbridge, Beaverton, Simcoe, Halton Hills, and Milton. 

While Barrie, Collingwood and Hillsdale are besides nether a vigor informing Monday, Environment Canada says it appears conditions volition autumn beneath the vigor informing criteria connected Tuesday. 

Daytime highs betwixt 30 to 33 C are expected for these areas, arsenic good arsenic humidex values betwixt 40 to 43, the upwind bureau said. 

Some metropolis pools had impermanent closures Sunday

Environment Canada has warned of "dangerous vigor and humidity" successful the GTA and surrounding areas starting Sunday afternoon. 

Over the weekend, immoderate City of Toronto pools acceptable extended hours owed to the vigor warning. But the metropolis said immoderate pools had impermanent closures due to the fact that of precocious humidex levels. 

"Given provincial requirements related to vigor and humidex (45C+) protocols, immoderate outdoor pools had intermittent closures contiguous to guarantee unit wellness and safety," the metropolis said successful a station connected X connected Sunday. 

Staff remained connected tract to re-open the pools arsenic soon arsenic possible, the station read. 

Coun. Brad Bradford called the closures "totally unacceptable" successful a station connected X connected Sunday. 

"Pools request to beryllium unfastened for radical to chill down connected what mightiness beryllium the hottest time of the year," the station read. "Instead, unit were closing pools and turning radical away." 

Environment Canada is advising radical to  limit vulnerability to prima and vigor by readying activities during the coolest parts of the day, arsenic good arsenic wearing a wide-brimmed chapeau and lightweight, light-coloured, escaped fitting clothing. 

People are advised to ticker for symptoms of vigor stroke, which is simply a aesculapian emergency, successful themselves and others. Symptoms tin see reddish and blistery skin, dizziness, nausea, disorder and alteration successful consciousness. 

"While you hold for aesculapian attention, effort to chill the idiosyncratic by moving them to a chill place, removing other clothing, applying acold h2o oregon crystal packs astir the body," Environment Canada said successful Monday's warning. 

WATCH | Environment Canada senior climatologist discusses GTA vigor wave: 

The upwind bureau besides advised radical to portion h2o often, adjacent earlier feeling thirsty, and adjacent blinds and unfastened windows if the extracurricular is cooler than inside. 

"If your surviving abstraction is hot, determination to a chill nationalist abstraction specified arsenic a cooling centre, assemblage centre, room oregon shaded park," the vigor informing says. 

People are besides advised to cheque successful regularly connected those astatine greater hazard of vigor illness, including the aged and those surviving alone. 

Signs of vigor exhaustion whitethorn see headache, nausea, dizziness, thirst, acheronian urine and aggravated fatigue. If you acquisition these symptoms, Environment Canada advises stopping your enactment and drinking water.