Heat wave intensifies across Quebec and Ontario, pushes east into the Maritimes
A persistent heat wave has gripped Quebec and Ontario and is extending into the Maritimes, with Environment Canada warning of dangerous temperatures and humidex values through Thursday, July 2, 2026.
Environment Canada issues widespread heat warnings
Environment Canada maintained heat warnings for much of Quebec and Ontario on Thursday, July 2, 2026, and expanded alerts to parts of New Brunswick, Nova Scotia and Prince Edward Island.
Officials said the heat wave shows no immediate sign of easing and urged residents to follow public health guidance as temperatures and humidity remain unusually high for this time of year.
High temperatures and extreme humidex readings recorded
In southern Quebec, daytime highs were forecast to exceed 30 degrees Celsius on Thursday and Friday, with humidex values—what many Canadians call the “feels-like” temperature—rising above 40.
Meteorological observations reported humidex readings as high as 44 in Montreal and 42 in Quebec City on Wednesday, July 1, 2026, underscoring the health risks posed by the combined heat and humidity.
Northern regions and Maritimes also under strain
Environment Canada advised that more northerly areas could see temperatures near 30 C, with humidex values between 35 and 40, elevating heat stress even where absolute temperatures are lower.
The agency warned that eastern provinces would not be spared, with new heat alerts issued for communities across the Maritimes as the hot air mass drifts eastward.
Severe storms, power outages and localized damage
The intense heat and humidity contributed to unstable conditions on Wednesday, producing violent thunderstorms that led to power outages and reported damage in several municipalities.
A brief tornado risk was issued for southwestern Quebec, and authorities reported fallen trees and other storm-related destruction, with the Saguenay–Lac-Saint-Jean region singled out as particularly affected.
Ottawa and Toronto events disrupted by weather
In the national capital, severe weather on Wednesday forced the cancellation of the Canada Day evening show; Environment Canada recorded about 110 millimetres of rain at Ottawa’s airport during the storm.
In Toronto, where a FIFA World Cup round-of-16 match between Portugal and Croatia was scheduled for Thursday, the city cancelled the planned public screening at Nathan Phillips Square because of extreme heat warnings, citing public-safety concerns.
Public health measures and municipal responses
Health authorities across affected provinces reiterated standard heat-wave precautions, urging people to stay hydrated, limit strenuous outdoor activity during peak heat, and check on vulnerable neighbours and relatives.
Municipalities opened or extended hours at cooling centres and public pools in many communities, while transit agencies and event organizers adjusted plans in response to the warnings and local conditions.
Forecast: relief expected by weekend
Environment Canada projected that temperatures and humidity would begin to decline starting Saturday morning, offering some relief after several days of sustained heat.
Forecasters cautioned, however, that the timing and magnitude of the cooldown could vary locally and advised residents to monitor official updates and heat advisories through the weekend.
The heat wave has prompted widespread precautions from health officials and local governments as communities balance outdoor activities, large events and infrastructure strains during an unusually intense period of summer heat.
