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Sweltering heat continues in Ontario, widespread thunderstorm risk on Monday

Sunday, June 21st 2020, 8:28 pm - The hot and sticky conditions have the potential to trigger convective thunderstorms in southern Ontario on Monday.

The week will begin with high temperatures and humidity that could trigger isolated thunderstorms in southern Ontario. Daytime highs will remain near or above 30°C, but the humidity will make it feel closer to the 40s in some locales. A cold front will track through the region on Tuesday and will wipe out the high humidity and will bring some relief from the muggy conditions. Details and timing, below.

Visit our Complete Guide to Summer 2020 for an in-depth look at the Summer Forecast, tips to plan for it and much more


WEATHER HIGHLIGHTS:

  • Remaining hot, muggy as the week begins
  • Isolated thunderstorm risk on Monday, severe storms are possible for some
  • Relief from heat, humidity will come mid-week
  • Keep on top of weather ALERTS in your area

MONDAY: UNSETTLED, THUNDERSTORM RISK

The start to the new week won't offer much relief from the heat with daytime highs on Monday remaining near or above 30°C. The humidity will make it feel more like the mid- to high-30s across a large section of the province.

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Like Sunday, the hot and sticky conditions have the potential to trigger convective thunderstorms. There is a significant amount of moisture available in the atmosphere, which means that heavy downpours could occur within thunderstorms.

Those at risk of seeing severe thunderstorms stretches from London to parts of western Quebec.

BEYOND: HEAT EASES OFF MID-WEEK

There will be relief by mid-week, thanks to a cold front cutting through late Tuesday, which is expected to cool off temperatures and wipe out the humidity.

However, it looks like the heat and humidity will return during the final days of June and continue through Canada Day.

Stay tuned to The Weather Network for the latest forecast updates.

WHY DOES A CAR HEAT UP SO QUICKLY?

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