Toronto could see record-breaking temperatures today. Live heat wave updates here

CP24’s Jessica Smith provides an update on weather conditions in Toronto and parts of the GTA.

The scorching temperatures in Toronto today could set a new record today as the mercury rises to the high 30s.

Toronto is expected to see a high of 38 C today, feeling closer to 45 with the humidity.

• Your hourly and 7-day forecast on our CP24.com weather hub

Follow along for live updates throughout the day:

12 p.m.- Heat-related illness can be an emergency

Toronto public health officials say early symptoms of heat-related illness include headache and fatigue. It can quickly escalate to an emergency when the symptoms become more severe and people become confused and have difficulty speaking.

11 a.m.- Pets impacted by heat

A spokesperson for the Toronto Humane Society said dog-owners should keep an eye out for heat-related illness.

The symptoms, he told CP24, include heavy panting, excessive drooling, bright red tongues and gums, and vomiting or diarrhea.

“Bring them to the shade or a cooler area right away, start dabbing them with cool water, hydrate them and then contact your vet immediately,” the spokesperson said. “You don’t want to wait.”

9 a.m.- GO trains running at slower speeds

Environment Canada says the heat warning impacts the speed of trains along the network.

“During prolonged periods of high heat, we are required to run trains at slower speeds. To ensure the safety of our customers and crew, slow orders are issued along the network,” Metrolinx said in an emailed statement.

“As a result, some trips may be cancelled or delayed on your line or arriving later than originally scheduled at their destination.”

Service updates can be found here.

8:05 a.m.- Tropical nights

Retired Environment Canada climatologist David Phillips said Toronto has seen more “tropical” nights so far this year than we typically see in a whole summer season.

“We get normally, in a year, we would get about nine or 10 what we call tropical nights where the temperature stays above 20 C,” he told Newstalk 1010.

“By the end of this week, we will have 11 or 12 of those.”

8 a.m.- Pool hours extended

Hours at select outdoor pools in Toronto have been extended until 11:45 p.m. tonight

7:30 a.m.- Record set in 1995

The hottest July 14 on record came back in 1995, when the temperature rose to 36.8 C.

7 a.m.- Toronto air quality among worst in world

Toronto’s air quality has been ranked 32nd for worst in the world this morning, according to According to IQAir, which tracks global air quality data.

6:30 a.m.- Hazy day expected

CP24 Weather Specialist Jess Smith says Toronto will see not only hot and humid weather on Tuesday, wildfire smoke in the upper atmosphere will lead to hazy conditions.

“We are going to see sun but it is going to be quite hazy,” Smith said on Tuesday morning.