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The high humidex values in Ontario join part of a wider swath of heat affecting Quebec and New Brunswick while much of southern Saskatchewan has been put on tornado watch.

Don’t expect any comfortable breezes to make it feel better

In cities such as Windsor and Toronto, temperatures Monday were consistent with last year on the same date.

Still, it’s some of the hottest weather the province has seen this summer.

“For most of Ontario this will be the first spell of more than two days in a row of 30 C or more,” McCormack said.

Environment Canada has issued humidex warnings covering much of the province, from Windsor in the south to as far north as Sault Ste. Marie and North Bay, as temperatures near 30 C or higher in most areas.

During a heat alert, the city advises residents to check on friends and senior citizens who may live alone. Residents are encouraged to cool down by visiting air-conditioned spaces like community centres, shopping malls or libraries.

McCormack is urging people to check on neighbours — especially the elderly, and to avoid intense work or exercise and stay in air-conditioned buildings.

People working outside should drink plenty of liquids, take frequent breaks, avoid high-protein foods and maintain salt levels in the body.

“Definitely make sure you remember your pets,” she says. “You don’t want to leave them in your car — even with the window rolled down they get really hot.”

McCormack says Friday could bring temperatures in the 30s, but less humidity.

The heat itself comes as a relief for some. William Tarraran, spokesman for Wild Water Kingdom in Brampton, said the heat is “phenomenal news” for the outdoor water park, which saw higher than average business for a Monday.

Attendance levels have been lower than average this year due to many forecasts of rain, he said.

“If they don’t see sun outside people aren’t going to obviously take a look at us as a destination for that day,” Tarraran said.

Meanwhile in London, Kevin Wu from Chil Frozen Yogurt Bar said it was also busy there for a Monday.

“Everyone has said they definitely need their frozen yogurt in this heat,” he said.

National Post, with files from The Canadian Press