Peak nears for days-long bout of extremely hot temperatures in Ontario, Quebec – The Weather Network

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Between the ridge and the humidity combined, we’re in for a days-long stretch of hot daytime highs and little to no relief from the stuffy air at night.

The heat arrived in earnest Tuesday, and will finally peak on Thursday, as daytime high temperatures climb into the lower to middle 30s for just about everyone throughout southern Ontario and southern Quebec. Widespread heat warnings are in effect.

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Humidex values could climb as high as the mid-40s throughout the Greater Toronto and Hamilton Area (GTHA), in and around Ottawa, and across Montreal. Record-breaking humidex values are possible across the GTHA, with 45.6 being the all-time monthly record that was set on June 30, 2018 in Toronto.

Humidex records will be challenged all across Ontario, and will be similar in magnitude to the June-July 2018 heat wave event. As we continue to move in the direction of a warming world, extreme heat events like these are expected to increase in frequency.

On Tuesday, North Bay, Ont., experienced its ninth-hottest June day on record, while Wiarton, Ont., saw its fourth-hottest June day on record

On Wednesday, Ottawa tied its current record for its most humid June day with a humidex value of 44.