Ontario heat warnings arrive with a multi-day storm risk
Stay hydrated in the heat—and stay aware of rapidly changing conditions
It’s certainly going to feel like July across southern Ontario this weekend as excessive heat builds and a risk for thunderstorms follows suit.
The rising heat will help fuel several opportunities for thunderstorms to pop up across the region. Some of the storms could reach severe limits at times.
Take it easy in the hot weather—high heat and humidity can affect even healthy individuals. Keep an eye on the radar as you go about your day and pay attention to watches and warnings in your area.
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Heat warnings in effect this weekend
Warm, southerly winds will help drag a humid airmass over southern Ontario this weekend.
Folks with chronic health conditions and those living without air conditioning may struggle this weekend as feels-like values climb to 40 or higher in many locations. Sunday will feel like 41 in Windsor, 40 in Toronto, and 41 in Ottawa.
In addition to the heat of the day, the mugginess will keep overnight temperatures on the warm side, precluding the ability to find meaningful relief after sundown.
Thunderstorm risk builds with the heat
Daytime heating and high humidity will fuel the instability needed for a risk for thunderstorms on Saturday afternoon.
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A cold front pushing into southern Ontario on Sunday could trigger severe thunderstorms across the region.
The exact location and strength of these storms is still uncertain—but given the instability and the arrival of the front, the potential will exist from London and Toronto to Ottawa on Sunday afternoon and evening.
This boundary and instability will remain in place heading into Monday, as well, bringing a second round of active weather to start the workweek.
Be sure to check back this weekend for the latest on the specifics surrounding the storm threat in your area.
Stay with The Weather Network for all the latest on conditions across Ontario.