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Limited Ontario storm risk Sunday, with high heat on the horizon next week

Saturday, July 11th 2020, 8:15 pm - Seasonal, if muggy, temperatures continue Sunday and into the next week, though another bout with uncomfortable heat is on the horizon.

Saturday's skies featured a few funnel clouds and water spouts, along with seasonal temperatures made to feel past 30 with the humidity. Sunday sees some lingering storm risk, though with little severe potential, and temperatures will stay below the 30-degree mark until late next week, when a building ridge of high pressure looks to send temperatures and humidex values back up to uncomfortable levels. Read on for a more detailed look.

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


  • Limited non-severe storm risk Sunday
  • Temperatures remain below 30°C into the first half of next week, though feeling hotter with the humidity
  • Uncomfortable heat beckons for the late week
  • Keep an eye on weather ALERTS in your area


As with Saturday, Sunday looks somewhat unsettled for southern Ontario, with light showers behind a passing front.

There is once again some storm risk, but it will be sustantially reduced from Saturday. Any storms that do spark will likely do so along the Golden Horseshoe and areas slightly east, stretching a little north above the 401, but they are not expected to reach the severe threshold.


Temperatures Sunday continue on from Saturday to once again feature daytime highs in the high 20s, after days above 30°C. But though these are closer to seasonal, they will still feel hotter than 30 due to the persistent humidity.


Beyond the weekend, temperatures look to remain more or less in the mid-to-high 20s, once again feeling like the low 30s or so for most people.

However, a building ridge of high pressure over the Great Lakes will once again bring the return of hotter temperatures later in the week, creeping once again above 30°C by Thursday, with humidex values feeling in the high 30s.

Ontario jet stream heat

However, this heat wave should be associated with more thunderstorms than what we have seen during the past few weeks, so at this point it doesn’t look like drought will be as big of a concern as it was during the prolonged heat event that marked the early days of July.

Stay tuned to The Weather Network as we continue to update the forecast.

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