Ontario Long Range Weather Forecast for September 21st to October 20th
September 2025
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20Fair, chilly.
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24Locally heavy showers and thunderstorms from the Great Lakes area and points east.
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28Fair, quite cool.
October 2025
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1Gusty showers.
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4Fair, pleasant weather, followed by increasingly cloudy skies.
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8Heavy showers and thunderstorms.
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12Partly sunny, pleasant for Thanksgiving holiday.
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16Showers Great Lakes and points east.
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20Gusty winds, showers.
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