Heat warning issued for southern Ontario, expected to last into Thursday

Environment Canada has issued a heat warning for southern Ontario Friday, saying hot and humid conditions could last into next Thursday.

The alert issued in the morning says daytime highs for areas between Windsor and Cornwall are expected to range from 29 C to 32 C, with the humidex making it feel like it’s 35 C to 40 C.

Overnight lows are expected to provide little relief, ranging from 19 to 23 degrees.

Medical officers of many cities in the affected area issued heat warnings, urging residents to stay hydrated, watch for signs of heat exhaustion, and to check on older adults and those at risk of heat illness.

The weather agency says the hottest day is expected to be Saturday and a shift in weather patterns July 17, is expected to end the long stretch of heat and humidity.

This is the third heat warning issued for southern Ontario this summer, including extreme heat that broke records in June.

How to stay cool during the heat warning

Heat warnings are issued when daytime temperatures are expected to reach at least 31 C with overnight temperatures above 20 C, or when the humidex is expected to reach 40 C for two or more days.

Many municipal recreational facilities are open to the public, so they can stay cool during the extreme heat, with each region listing cooling spaces to avoid the weather.

The City of Hamilton’s heat warnings map found here, which lists community partners, recreation centres, pools and spray pads.

All regularly scheduled open swims will be free to the public during heat warnings.

The Niagara Region website found here, links to many cities and towns with their own hot weather relief plans.

For people living in the Halton Region, cooling centres and recreation water facilities can be located on their official page here.

Residents can also find cooling locations near the City of Brantford on their official page here.

Anyone wanting to hit the sand should check if beaches are open and safe for swimming before making the trip.

Hamilton’s beach water quality page can be found here, and beach water testing results in the Niagara Region can be found here.

During extended periods of extreme heat, residents should be wary of heat exhaustion and watch out for signs of heavy sweating, weakness, cold, pale or clammy skin, a weak pulse, fainting, and vomiting.

If experiencing symptoms, people are advised to seek help right away and call 911.

With files from The Canadian Press.

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