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Summary

Ontario's weather is calling for a 'sharp cold front' with rain and a 14-degree nosedive

All good things must come to an end. 🥲

Toronto skyline on a cloudy, gloomy day (illustrative).

Ontario's weather is in for a sharp turn this week.

Contributor

Get ready, Ontario — it may be feeling summery now, but this unseasonable warmth won't last much longer.

According to the latest Ontario weather forecast from The Weather Network (TWN), the province is in for a major shift this week. After enjoying temperatures over 15 degrees above seasonal for several days, thanks to a ridge of high pressure over the Great Lakes, a cold front will move in by Wednesday afternoon, bringing Ontario back to typical fall conditions.

Southern and eastern Ontario cities like Toronto, Ottawa and Windsor have been soaking up daytime highs in the low-to-mid 20s, with Toronto even seeing lows warmer than the usual daytime highs for this time of year. But as TWN reports, the warmth is coming to an abrupt end, and by Thursday, some areas could experience temperatures that are actually a few degrees below seasonal.

Meanwhile, northern Ontario hasn't been left out of the heatwave either. Places like Sudbury, Timmins and Sault Ste. Marie have all seen temperatures more than 10 degrees above seasonal, with highs reaching into the low 20s — a rare sight for this time of year!

But, as TWN warns, all good things must come to an end. This unseasonably warm stretch is about to be cut short by a strong cold front that will sweep across the province on Wednesday.

By Thursday, temperatures will drop significantly, bringing many areas a few degrees below seasonal. For example, Sudbury will fall back to 10 degrees, while Ottawa is expected to hit a chilly 9. In Toronto, daytime highs will barely reach 11, which is actually a degree below normal for this time of year.

What's wild is how far above normal these temperatures have been — Toronto saw a high of 23 on Monday, which is 11 degrees warmer than average, while in Timmins, temperatures hit 22, a whopping 15 degrees above the usual fall chill.

But despite these impressive highs, this warmth is not unprecedented. In fact, TWN notes that southern Ontario has seen temperatures hit 25 degrees even as late as November 10 in cities like Hamilton and Windsor. So while this is unusual, it's not the latest we've seen the mercury climb this high.

With the cold front on Wednesday also comes a chance of scattered showers, though rain amounts are expected to be light, and some areas could stay dry. By Saturday, the cooler air will be accompanied by blustery winds and the potential for lake-effect showers in some regions. Sunday will offer a slight reprieve with fair but cool conditions.

For now, if you're in southern Ontario, northern Ontario, or anywhere in between, enjoy these last warm days while you can — fall is officially coming back with a bang. Stay cozy, Ontario!

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AI tools may have been used to support the creation or distribution of this content; however, it has been carefully edited and fact-checked by a member of Narcity's Editorial team. For more information on our use of AI, please visit our Editorial Standards page.

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