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Late summer weather returns to southern Ontario ahead of Fall Equinox

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Dr. Doug Gillham
Meteorologist, PhD

Tuesday, September 16, 2014, 10:49 AM - The good news: The final weekend of the summer (Autumnal Equinox is Tuesday, September 23) will feature a return to above seasonal weather.

But...

In the meantime it’ll be below seasonal temperatures across southern Ontario through Friday with a cold front crossing southern Ontario late Wednesday to reinforce the chilly weather.


2014/15 WINTER PREVIEW: All eyes on El Nino


Thursday will bring the coldest daytime temperatures of the week with highs struggling to reach the mid-teens, which is more typical of mid-October.

Friday morning will be the coldest morning that we have since last spring as parts of southern Ontario, including the outskirts of the Greater Toronto Area (GTA) will see frost.

While temperatures will stay well above freezing in the more urban regions of the GTA and along the shorelines of the Great Lakes, much of cottage country and eastern Ontario will drop to near or just below freezing. The Kitchener Waterloo region will also be cold enough for patchy frost.

Temperatures will recover nicely by Friday afternoon with abundant sunshine, and the warm-up will continue into the weekend.

Saturday will be rather breezy and warmer with high temperatures reaching the low to mid-20s with a mixture of sun and some clouds.

A period of rain is likely during Sunday, but the timing is still uncertain due to the potential for the system to merge with energy and moisture from the remnants of Odile, which is the hurricane that made landfall over Mexico earlier this week.


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If the remnants of Tropical Storm Odile interact with the system coming through the Great Lakes, we will receive a significant soaking rain later Sunday into Sunday night, but if the systems remain separate, the front will come through earlier on Sunday but with lesser rain amounts.

While autumn does not officially arrive until 10:29 P.M. ET on Tuesday, our weather will feel rather autumnal again on both Monday and Tuesday with temperatures more typical of October.

However, it looks like the cool-down will just last a few days with a warm-up expected during the middle to end of next week.

Morning Briefing: Four things to know about Tuesday
It's time: Friday's looking frosty in Ontario
Chilly week ahead for Ontario
El Niño and its impact on Winter 2014/15: Pattern resembles last winter

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