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Environment Canada has issued a heat warning for the Montreal area, forecasting an especially humid day Tuesday, with humidex values expected to register in the low 40s throughout the day.

The “warm and humid conditions” settling over southern Quebec — including the Châteauguay-La Prairie, Laval and Longueuil-Varennes areas — will likely persist into Wednesday, the agency said.

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The federal agency advises that outdoor activities be rescheduled. Health risks to young children can be reduced by cooling them often, hydrating them adequately and reducing their exposure to heat, according to Environment Canada.

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

Relief is forecast to arrive Thursday and continue Friday, when it is expected to be sunny, with a high for both days of only 24C, and evening lows of 12C and 13C respectively. The temperature will begin creeping up Saturday to 26C and Sunday to 27C when clouds will make a return.