Grammar Airport Weather Forecast

    • 51
    • 74

    Rain Showers

    • 44
    • 57

    Rain Showers

    • 45
    • 63

    Rain Showers Likely

    • 42
    • 56

    Rain Showers Likely

    • 40
    • 53

    Rain Showers Likely

    • 40
    • 53

    Chance Rain Showers

Today 19 Oct Ontario

Sunny in the Morning, then becoming mostly cloudy. Breezy, warm with Highs Ranging from the upper 60s on the Hilltops to the mid 70s across the lower Elevations. South Winds 10 to 20 Mph with Gusts up to 40 Mph.

Tonight 19 Oct Ontario

Showers, Breezy, mild with Lows Ranging from the upper 40s on the Hilltops to the lower 50s across the lower Elevations. South Winds 10 to 20 Mph with Gusts up to 40 Mph in the Evening, becoming west. Chance of rain near 100 percent.

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Grammar Airport Temperature Statistics

October Temperature

Penn Yan, Penn Yan Airport (16.2 miles)

  • Lowest 9 October, 2025

    32 °F

  • Average October

    56.3 °F

  • Highest 6 October, 2025

    84 °F

Climate (2020–Present)

Penn Yan, Penn Yan Airport (16.2 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    59.4 °F
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