Hot, humid weather settled over much of Ontario and parts of Quebec on Saturday with Environment Canada warning of a multi-day heat wave set to bring even higher temperatures Sunday and Monday.

Environment Canada said several days of sweltering conditions began taking hold of southern Ontario and half of northeast Ontario on Saturday, blanketing communities including Windsor, Timmins, Sudbury, Toronto and Ottawa.

A severe weather meteorologist with the federal agency said the wave extended across the provincial border with Quebec to encompass regions including Montreal, pushing daytime highs to 35 C in southern areas and 33 C in the north, with the humidex at or near 40 C.

Weiqing Zhang warned that Saturday was just the beginning of uncomfortably warm weather.

“The hottest day will be

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