The Canadian National Weather Agency has warned of rising temperatures in the Toronto area today, Monday.

The warning issued by Environment Canada on Sunday predicts that daytime temperatures will reach around 31 degrees Celsius in many areas, including Toronto, Hamilton, Burlington-Oakville, Halton Hills-Milton, and Mississauga-Brampton. With humidity, some areas will feel like temperatures ranging from 35 to 38 degrees.

Environment Canada stated that there will not be much relief overnight as overnight low temperatures are expected to reach only 20 degrees Celsius or higher. A cooler air mass is expected to arrive on Tuesday evening.

Older adults, infants, young children, pregnant women, and individuals with physical and/or mental health conditions, as well as those with disabilities or mobility issues, may face greater health risks due to the heat.

People are urged to be cautious of the effects of heat-related illnesses, which include swelling, rashes, cramps, fainting, heat exhaustion, heat stroke, and worsening of certain health conditions.

Environment Canada advised, "Drink plenty of water regularly, even before you feel thirsty to reduce the risk of dehydration. Thirst is not a good indicator of dehydration," and "Never leave people, especially children, or pets inside a parked vehicle."

Potential Delays at Toronto Pearson Airport

Toronto Pearson International Airport has warned travelers of potential delays due to the heat.

"We expect it to be a hot day as heat warnings issued by Environment Canada state that daytime temperatures are expected to reach 35 to 38 degrees with humidity," according to a statement shared on social media on Monday morning.

"In this heat, our focus is on providing adequate breaks to allow outdoor workers to stay refreshed. This means your aircraft may take longer than expected to reach the gate, or your baggage processing may be delayed."

The airport mentioned that flights from Pearson to Texas may also experience disruptions on Monday as the airport monitors the impacts of Hurricane Barry.