A stormy end to the September heat sweeps across Ontario, Quebec Thursday
Unusual September heat brought a series of record-breaking temperatures.
Saint-Anicet, Que., broke the September provincial humidex record for Quebec with a value of 43.4°C. Moosonee, Ont., also broke its September all-time temperature record, reaching a sizzling 35.1°C on Tuesday.
The unbearable heat and humidity may soon be behind us. A stormy change will sweep out the 30+ degree heat across Ontario and Quebec by Thursday.
Thursday
Timing: Morning into the evening
Location: southern and eastern Ontario, southern and eastern Quebec
Weather: Cloudy, rainy, weather takes over on Thursday as the same slow-moving boundary that swept through much of Ontario and Quebec moves eastward. Areas across the Greater Toronto Area (GTA) and around the St. Lawrence could see isolated thunderstorms with thunderstorms throughout the day.
LOOK AHEAD: Warm or cool? Reversing patterns to dominate Canada in September
The ample heat will leave behind enough thunderstorm energy to possibly produce severe thunderstorms and large hail in southeastern Quebec.
Beyond
The rain is in no hurry to leave Ontario and some may see periods of showers into Friday as well.
Humidex values hold onto an uncomfortable mid to low 30s until a more seasonable air mass settles in post-weekend.
Although temperatures will be much cooler, periods of rainfall may interrupt weekend plans to enjoy it.
The arrival of September marked the start of meteorological fall, though the autumnal equinox doesn’t officially occur until the wee morning hours of Saturday, Sept. 23.
Join us for the release of our 2023 Fall Forecast on Wednesday, Sept. 13. Our experts will take a look at temperature and precipitation trends for the upcoming season, revealing what you can expect during this highly changeable season across Canada.
WATCH: What longer, hotter, and more frequent heat waves means for your health
Thumbnail courtesy of Mark Robinson.
Stay tuned to The Weather Network for more forecast updates for Ontario.
