Toronto officials are sounding the alarm as we brace for what could be the most intense heat wave of the summer. Environment Canada has issued a heat warning for the city and surrounding regions with humidex values expected to climb into the low 40s throughout the weekend.
“This isn’t just your typical summer heat,” warns Dr. Eileen de Villa, Toronto’s Medical Officer of Health. “When we see humidex values pushing above 40, we’re talking about conditions that can be dangerous for vulnerable populations.”
The scorching temperatures are expected to begin Friday afternoon with daytime highs near 31°C, feeling closer to 38 with humidity. By Saturday, those values could reach a sweltering 42, making it feel like you’re walking through soup rather than air.
Toronto has activated its Heat Relief Network in response, opening cooling centres across the city. Libraries, community centres, and several public buildings will offer extended hours for residents seeking respite from the heat.
“We’ve prepared 14 dedicated cooling spaces that will remain open until 7 p.m. throughout the weekend,” says Mary-Anne Bédard from the city’s Shelter, Support and Housing Administration. “No one will be turned away.“
The heat wave comes as many summer events are scheduled across the city, including outdoor festivals and the Caribbean Carnival’s grand parade along Lake Shore Boulevard on Saturday. Organizers have added misting stations and are bringing in additional medical staff as precautionary measures.
TTC officials have also announced they’ll be slowing subway trains on above-ground portions of track, as extreme heat can cause rail issues. Passengers should expect minor delays, particularly on Line 1 and Line 2.
Toronto Hydro is preparing for increased demand as air conditioners work overtime. The utility company has asked residents to consider limiting electricity usage during peak hours between 3 and 7 p.m.
“Simple steps like closing blinds during the day and postponing use of major appliances until evening can make a significant difference,” explains Toronto Hydro spokesperson Russell Baker. “These measures help prevent potential brownouts and reduce strain on the system.”
Health officials are particularly concerned about seniors, young children, pregnant women, and those with chronic illnesses. Dr. de Villa recommends checking on vulnerable neighbours and family members throughout the weekend.
“Heat-related illness can progress quickly,” she cautions. “Signs to watch for include dizziness, rapid breathing, headache, and extreme thirst.”
The city’s Street Outreach teams have increased patrols to distribute water and sunscreen to people experiencing homelessness. Several downtown drop-in centres have extended their hours through Sunday.
While many residents may head to beaches seeking relief, Toronto Public Health reminds swimmers to check water quality reports before diving in. Recent rainfall could affect E. coli levels at some beaches.
Weather forecasters expect the heat to break by Monday afternoon when a cold front is predicted to move through southern Ontario, bringing thunderstorms and cooler temperatures for the start of the work week.
Until then, Torontonians are advised to stay hydrated, limit outdoor activities, never leave children or pets in parked vehicles, and take frequent breaks in air-conditioned spaces when possible.
