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Temperatures drop in Ontario, Quebec as storm risk persists on Monday

Sunday, May 15th 2022, 9:29 am - The summer-like warmth in Ontario and Quebec will be swept away this week and temperatures will fall below 20°C.

Temperatures will drop a few degrees below seasonal behind a cold front, putting an end to the early tease of summertime weather in southern Ontario. On Monday, temperatures will fall to the low 20s and teens.

Quebec will remain a bit warmer with another day of summer-like heat with temperatures into the mid-20s and feels-like values approaching or exceeding 30.

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A quick round of rain will arrive across southern Ontario in time for the morning commute on Monday. The rain will not be a daylong event, but prepare for some slowdowns in the morning as commuters navigate wet roadways.

on temp

There is also the chance for thunderstorms, though the risk is on a much lower scale than on the weekend. The general threat stretches from southwestern Ontario, Niagara region and the Greater Toronto Area (GTA) to southern and eastern Quebec.

Southeastern Ontario and southern Quebec could see stronger storms pop up, possibly reaching severe criteria, with possible hazards of torrential rainfall, localized flooding and strong wind gusts.

on risk

Montreal, Que., might be susceptible to some flash flooding in this setup, as storms train in from the south. Precipitable water available for storms is at 40 mm, which is why torrential rain and localized flooding are currently highlighted as the main hazards.


Temperatures falling on the cooler side of seasonal will make this week feel more like late-April than the middle of May. Daytime highs will reach the single and low double digits for most areas across the north, but mid-to-upper teens are still likely across the south.


Some higher elevations in southern Ontario will even need to watch out for frost during the mid-week mornings, as temperatures creep towards the freezing mark.

For those who couldn't get enough of the warmth, the signal is there late next week for temperatures to make a triumphant return into the upper 20s with another ridge taking shape.

Temperatures should rebound back to seasonal and possibly above seasonal for the start of the May long weekend that follows.

Be sure to check back for the latest weather updates across southern Ontario and Quebec.

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