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Friday could see some places in Ontario reach their highest temperatures of 2014

Summer Weather for 1st week of School; Fall Weather for the Weekend

Dr. Doug Gillham
Meteorologist, PhD

Wednesday, September 3, 2014, 11:28 AM - The first week of September continues to feature warmer weather than what we saw during most of July and August across Southern Ontario. While today is noticeably less humid, temperatures are still well above seasonal and the heat and humidity will rebuild during Thursday and Friday.

Friday will likely be the hottest day of the week, and in some places it may be the hottest day of the summer. While it is unlikely that Toronto’s Pearson Airport will exceed 32.2 C which was reached on August 26, Hamilton should exceed its 2014 high of 30.3 C which was set way back on June 17.

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The key to the high temperatures on Friday will be the timing of the cold front which will bring increasing clouds and a period of rain and thunderstorms to the region late in the day. Areas away from the lakes that see sunshine into the mid-afternoon should reach the lower 30s with a humidex near 40.

During the afternoon and evening on Friday, showers and thunderstorms will develop and track across much of Southern Ontario. Strong to severe storms are possible around the GTA and localized torrential downpours could impact the evening commute.

The weekend will be much cooler across Southern Ontario with temperatures only in the upper teens to near 20 C. Showers will linger into Saturday morning, but during the afternoon sunshine spread across the region, arriving first in cottage country and then reaching Lake Erie by late afternoon or evening.

Sunday morning will feel like fall with low temperatures outside of the city dipping into the single digits, but with abundant sunshine high temperatures will recover to near seasonal (lower 20s).

As we head into next week, temperatures should recover somewhat with some models showing the potential for above seasonal temperatures for a couple days during mid-week, (though not as warm as this week). However, it looks like another strong cold front will arrive late in the week and bring below seasonal temperatures as we head into next weekend.

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