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Hot, humid weather approaching Ontario with a scattered storm risk

Wednesday, August 19th 2020, 9:03 pm - There is the risk of showers, thunderstorms in parts of southern Ontario at the end of the week.

Despite the relatively cool conditions that many have recently experienced in southern Ontario, it is still summer and most of the region will soon see hot and humid weather. Temperatures will be near-seasonal on Thursday before they climb on Friday. High humidity and hot weather will persist into early next week, but there is the chance of thunderstorms in some regions. Details and timing, below.


  • Temperatures begin to climb on Thursday
  • Scattered risk for showers, storms on Friday and through the weekend
  • Keep on top of severe weather ALERTS in your area


Thursday will start off rather cool, but temperatures will be several degrees warmer, near seasonal, by the afternoon across southern Ontario. While the south will be dry, cottage country will see showers continue to track through in the morning, with embedded thunderstorms.

Daytime highs will be hovering closer to the mid-20s as warmer air begins to filter back into the southern half of the province.


In the evening, there may be an isolated shower north of the GTA, towards the Peterborough area.

The Weather Network meteorologist Tyler Hamilton says that rounds of thunderstorms will track through Ontario over the next few days. The storms will impact central and northern Ontario on Thursday and reach Ottawa and other eastern parts of the province on Friday.


After a brief taste of early fall, heat and humidity will return to southern Ontario on Friday and continue through the weekend and into early next week with temperatures reaching the upper 20s and lower 30s. The humidex will reach the upper 30s and possibly near 40 with a risk for scattered thunderstorms on Sunday.


However, there is a rather tricky temperature forecast for central and eastern Ontario on Friday and through the weekend, as there is uncertainty as to how far north the heat will reach. There will also be a threat for showers and thunderstorms near the warm front, which will also keep temperatures down.

"The first cold front that was expected for early next week won’t make it to southern Ontario, so muggy weather will continue into early next week. Still uncertainty in the timing of the second front and how far south it gets," The Weather Network meteorologist Dr. Doug Gillham says.

However, we should see a few days of cooler weather mid and late week, Gillham adds. With the slower timing, there is the chance next weekend will be cooler than seasonal, as well.

Keep an eye on the forecast as we continue to monitor Ontario's weather outlook.

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