Published on Mar. 29, 2026, 5:00 PM
The next few days are forecast to bring dynamic and changing weather across southern Ontario, showcasing the volatility of spring
Southern Ontario will get a good taste of spring this week, both the ups and downs that it can bring each year.
That means warmth, heavy rainfall and a thunderstorm risk early this week, along with a cooldown and even some snow for some areas in Ontario.
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Going forward into April, it appears that spring will continue to test our patience as we get deeper into the month. The roller-coaster is going in the right direction, though, as the dips won’t be as cold and the peaks are getting warmer. But the consistent, warmer-than-normal weather is not expected.
Thunderstorms, heavy rain and snow this week
By Monday, a light, southerly flow bumps up temperatures, pushing temperatures well above seasonal (10+ degrees in some cases).
Temperatures are likely to push into the low 20s across extreme southwestern Ontario (Sarnia, Windsor), while temperatures in the upper teens are likely near the Niagara Escarpment, aided by gusty, westerly winds.
On Monday night, the thunderstorm risk increases across southwestern Ontario, thanks to an upper wave migrating into the area, providing increasing moisture and a more unstable air mass.
