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Midsummer heat likely for parts of Ont., stormy long weekend

The Weather Network logo The Weather Network 2017-05-15

This week will feel a lot more like summer in southern Ontario, with temperatures expected to creep towards the 30oC mark by midweek for some cities.

However, with warm and muggy weather comes the risk of thunderstorms.

"Next system tracks into northern Ontario Wednesday, with widespread rain and embedded thunderstorms," says The Weather Network meteorologist Tyler Hamilton. 

"Hot and humid conditions in the warm sector to the south."

A strong southerly flow will bump up temperatures Wednesday and Thursday in the south, with widespread daytime highs in the mid-to-high 20s. It will feel closer to 35 with the humidity for places like Windsor.

Scattered showers and thunderstorms are expected for southern Ontario late Thursday ahead of the cold front.

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While May snow is something that most of us are not keen on welcoming, it's possible for some parts of the province.

"Corridor of active weather across central and northern Ontario, with locally heavy rain and thunderstorms ending with a period of wet snow for some along the Trans-Canada (near Timmins)," says The Weather Network meteorologist Dr. Doug Gillham.

It will dry out for Friday, leaving fair and cool conditions through Saturday in southern Ontario.

"Coolest weather will be near the west end of Lake Ontario with an east wind -- near seasonal for Cottage Country," adds Gillham.

Victoria Day Long Weekend

Showers are on tap for northwestern Ontario Saturday into Sunday, courtesy of a new low pressure system.

By Saturday evening, southern portions of the province will begin to see increasing cloud cover, with rain developing and thunderstorms likely Saturday night into Sunday.

"Wide range in temperatures as heat and humidity returns to southwestern Ontario, but east wind keeps the Greater Toronto Area cool until Sunday night," says Gillham.

Conditions are forecast to improve during Victoria Day, however, timing is uncertain this far out.

"Temperatures near to below seasonal for Victoria Day and cool weather expected through the middle of next week," adds Gillham.

Check back for details as we continue to monitor the forecast.


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