Ontario Long Range Weather Forecast for September 11th to October 10th
September 2026
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8th
– 11th
Eastern Ontario begins dry and cool, but winds increase, and showers develop by the 10th.
-
12th
– 15th
Southwestern Ontario may see thunderstorms around the 14th, with sharp temperature swings and gusty winds.
-
16th
– 19th
Northern Ontario starts fair and mild, but colder air and brisk winds arrive by the 19th.
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