Southern Ontario isn't ready to give up the keys to winter just yet.

Forecasters predict that Tuesday will comfortably exceed 20°C across much of the region, a nice bonus for mid-October — before a fast drop midweek and another warm-up over the weekend.

Historically, that is when T-shirt weather typically ends. Over the last decade, Toronto's final 20°C day has averaged October 22, with the most recent record set on November 10, 2020.

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Ottawa follows a similar seasonal pattern, with its latest 20°C temperature falling between October 10 and November 11.

[Ontario, Last, Hot, Weather, October 13, 2025. (The Weather Network/Tyler Hamilton)] Ontario, Last, Hot, Weather, October 13, 2025. (The Weather Network/Tyler Hamilton)

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