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After a welcomed stretch of milder weather at the end of July, Ontario's weather forecast is predicting the arrival of yet another scorching heatwave this week.

According to The Weather Network, daytime temperatures will rise into the lower 30s on Monday with high humidity levels making it feel closer to 40 C in areas such as Toronto, Windsor, London and St. Catharines.

In fact, temperatures will be so sweltering that TWN has revealed that this will be the hottest week of summer.

The extreme heat will bring about widespread storm risk for southern Ontario today with large hail, strong winds and torrential rain to be expected.

"A fair bit of severe storm risk Monday and Tuesday across almost all of the south, with the humidity in particular setting up any potential storms to feature very heavy local downpours, possibly even triggering localized flooding," TWN reports.

Environment Canada is warning residents to limit their time outdoors and drink plenty of water to stay cool.

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