It could feel like 40 tomorrow. Here is how long the extreme heat will last

Toronto is under a heat warning, with sweltering daytime highs between 29 C and 32 C degrees and feeling closer to 40 C with humidity until Thursday.

A heat warning has been issued for Toronto ahead of a “prolonged period” of sweltering conditions that Environment Canada says could last until Thursday.

The weather agency issued the warning on Friday morning ahead of a scorcher of a day that could see the mercury soar to 30 C but feel closer to 37 with the humidex.

Conditions are expected to get even warmer on Saturday, with Environment Canada forecasting a high of 32 C that will feel as hot as 41 with the humidex.

• For the full forecast follow this link

There might be a little relief on Sunday with a 60 per cent chance of showers but the temperature is still expected to reach a daytime high of 30 C.

In fact, Environment Canada says that daytime highs will hover between 29 C and 32 C for much of the next week, with the humidex often making it feel like 35 to 40.

The weather agency says that overnight lows during this stretch will be 19 C to 23 C “providing little relief from the heat.”

“This week southern Ontario will experience hot and humid conditions. The temperatures and humidex will meet or be extremely close to heat warning criteria, with the hottest day being Saturday,” the warning from Environment Canadas states. “A shift in the weather pattern on Thursday will likely end this multi-day period of heat and humidity. Take action to protect yourself and others – extreme heat can affect everyone’s health.”

Toronto says the Metro Hall lobby area will become a 24/7 cool space starting 7 p.m. Friday and  the following air-conditioned civic buildings will be open to the public on extended hours during the heat warning:

• North York Civic Centre – From 7:30 a.m. weekdays and 8 a.m. weekends until 9:30 p.m.
• Scarborough Civic Centre – From 8 a.m. weekdays and 10 a.m. weekends until 9:30 p.m.
• Etobicoke Civic Centre – From 8 a.m. weekdays and 10 a.m. weekends until 9:30 p.m.
• York Civic Centre – From 8 a.m. weekdays and 10 a.m. weekends until 9:30 p.m.
• East York Civic Centre – From 8 a.m. weekdays and 10 a.m. weekends until 9:30 p.m.

Meanwhile, 57 city outdoor pools are open daily from 10 a.m. to 8 p.m. The following pools are open until 11:45 p.m. while the heat warning is in effect:

• Alex Duff Memorial Pool at Christie Pits Park, 779 Crawford St.
• Fairbank Memorial Swimming Pool, 2213 Dufferin St.
• McGregor Park Community Centre, 2231 Lawrence Ave. E.
• Monarch Park, 115 Felstead Ave.
• North Toronto Memorial Community Centre, 200 Eglinton Ave. W.
• Smithfield Park, 175 Mount Olive Dr.
• Sunnyside Gus Ryder Outdoor Pool, 1755 Lake Shore Blvd. W.
• Halbert Park, 24 Rockwood Dr. (until 9 p.m.)