Today’s warning comes with humidex values expecting to reach the low 40s and a risk of thunderstorms.
“Maximum temperatures will approach 30°C with humidex values reaching near 40°C in the afternoon,” says the website. “A cold front moving through late in the day will bring an end to this heat event.”
The uncomfortable and muggy conditions will affect Châteauguay, Laval, Longueuil and the Island of Montreal.
Montreal will also deal with southern winds of up to 33 km/h and wind gusts up to 50 km/h.
The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
The high temperature and humidity conditions are expected to pose a risk of heat stroke and/or heat exhaustion.
Environment Canada recommends drinking plenty of fluids, wearing breathable clothing, hats and sunscreen and people are urged to check-in on vulnerable neighbours, friends and family members.
Stay cool, Montreal.