Published on Apr. 13, 2026, 11:29 AM
Updated on Apr. 13, 2026, 11:50 AM
Southern and eastern Ontario will see unseasonably warm temperatures near 20°C this week, accompanied by gusty winds up to 60 km/h and moisture-fuelled storms. Heavy rain, thunderstorms, and showers are expected through midweek
Don’t forget an umbrella while heading out in the coming days, as southern Ontario will experience a warmer pattern, but with multiple systems bringing increased chances of heavy rainfall and thunderstorms.
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Some areas could see as much as 50-100 mm of rain through the week ahead. Special weather statements and yellow-coded rainfall warnings are in effect.
Weather Highlights:
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Southern and eastern Ontario will experience daytime highs in the high teens to above 20°C this week
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Thunderstorms move into Ontario Monday overnight, bringing heavy downpours, lightning, and small hail Tuesday morning. Wednesday and Thursday continue the stormy trend
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Water will likely pool on roads and in low-lying areas. Don’t drive through flooded roadways
Major warm-up marked with period of heavy rain and thunderstorms across southern Ontario
A surge of warm southerly air is set to dominate southern and eastern Ontario this week, with daytime highs reaching the high teens to above 20°C—temperatures more typical of late May than mid-April. Strong southwesterly winds, gusting up to 60 km/h, will accompany this warmth, alongside moisture-rich systems drawing energy from the Gulf of Mexico. Colder air fighting back in the north will create an active storm track over southern Ontario this week.
Monday overnight: A strong cluster of thunderstorms from the U.S. is set to cross Michigan overnight, potentially impacting the Lake Huron shores by early Tuesday morning.
Tuesday: Early-morning thunderstorms will track through southwestern Ontario and the Greater Toronto Area (GTA), potentially disrupting the morning commute.
These storms may bring heavy downpours, frequent lightning, and small hail.
