Thunderstorms Loom Over Southern Ontario This Tuesday

Summer isn’t quite ready to say goodbye, and that stubborn heat is hitching a ride northward into southern Ontario. A high‑pressure ridge over the southern Mississippi Valley is funneling hot, muggy air into the region, so expect the thermometer to sit in the mid‑20s Celsius while the humidex makes it feel like the low‑30s.

That moisture‑laden air mass doesn’t travel alone. By Tuesday afternoon a stalled frontal boundary will begin to wobble a bit, nudging the warm air right over the province. The result? A growing chance of thunderstorms after sundown, especially across the southwest. Those storms could dump a quick inch or two of rain, and with the ground already damp, localized flash flooding can’t be ruled out.

Temperatures north of the front should stay dry and relatively comfortable, but south of it the air will be thick, sticky and prone to sudden downpours. Forecast models are still playing catch‑up, so the exact timing and intensity of rain remain a bit uncertain.

Looking beyond Tuesday, the week turns into an active storm track. A lingering heat dome will keep the atmosphere primed for showers and occasional thunder through the weekend. Early next week may bring a brief cool‑down, but by mid‑week warmer-than‑normal days are expected to return, pushing September’s end into the warm‑hand side of average.

Residents should keep an eye on local weather alerts, especially if you’re heading out late Tuesday or planning outdoor activities this weekend. A quick check on The Weather Network or your phone’s alert system can make the difference between a soggy surprise and a dry outing.