Toronto, surrounding regions under heat warning until Tuesday, Environment Canada says

Get ready to turn up the air conditioning as swelteringly humid weather is expected to hit the GTA this week.

In an alert issued on Saturday, Environment Canada said a “heat event” for southern Ontario is forecasted to begin on Sunday and may continue into Tuesday before a cooler air mass is expected to arrive. 

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Toronto Pearson airport warned that temperatures in the high 30s could trigger delayed gate arrivals.

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