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Final days of sunshine before a long stretch of rain threatens southern Ontario

Wednesday, June 23rd 2021, 6:40 pm - After a brief break from the heat earlier this week, warmth and humidity are returning ahead of a long stretch of soggy weather that kicks off this weekend.

The cooler days of the early week are behind us, as more seasonal warmth and humidity are slowly beginning to suffuse itself back into Ontario's weather – with a few opportunities for soaking rains, and thunderstorms, this weekend and beyond, with a lot of soggy weather threatening one of the most popular summer vacation times next week. The good news is these "drought-busting rains" could help wipe out the major moisture deficits that have marked June so far. More on the incoming temperature climb, the next bout of rain and when the consistent summer heat builds back, below.

Visit our Complete Guide to Summer 2021 for an in-depth look at the Summer Forecast, tips to plan for it and much more!


The start of this past week was certainly below-seasonal, in fact some of the coolest temperatures in weeks, though by no means a return to winter.

Wednesday, however, saw the start of a return to something more like the early days of summer, though still comfortable and beneath clear skies.

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Thursday will be even warmer, with daytime highs hitting the upper 20s, approaching or even hitting the 30-degree mark in some locales. With the humidity also beginning to creep back into the mix, the feels-like values will be into the low 30s.

Depending on how much sunshine there is on Friday, with more clouds in place ahead of the next system, there's the chance for some places to reach 30°C once again. Humidity will be more widespread, with most locations feeling like the low-to-mid 30s.

ONTempFri (June 22)


A potent system is expected to track into the Great Lakes, with periods of rain and thunderstorms reaching southern Ontario late Friday and continuing through the weekend across the region. Locally heavy rainfall is possible.

"There's still some uncertainty on the timing with multiple waves of rain and storms, but it looks like there will be a useable period of dry weather during the middle of the day," says Dr. Doug Gillham, a meteorologist at The Weather Network.

The highest threat for rain looks to come early and then again late in the day.


As for Sunday, it's a tricky forecast across southern Ontario with two potential scenarios at play. The first could bring periods of rain and thunderstorms and temperatures on the cool side of seasonal.

"However, if the front lifts further to the north, the GTA will see some sunshine and become hot and humid while the focus of the thunderstorms would be towards cottage country, with the GTA remaining mostly rain-free throughout the day," Gillham says.

Near seasonal conditions will return early next week, though with the risk for an unsettled and active pattern to persist. It's a popular vacation week with Canada Day falling on Thursday, which could bring a lot of rain that would impact outdoor plans.


This would have a huge impact on agriculture, however, as these drought-busting rains could help to wipe out the June deficits, but it also brings the risk of flooding fields. There's still some uncertainty with this long-range forecast, so it will definitely be something to watch as we head into next week.

Be sure to check for the latest updates on the weather across Ontario.

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