Grammar Airport Weather Forecast

    • 67
    • 79

    Rain Showers

    • 54
    • 76

    Partly Sunny

    • 54
    • 71

    Mostly Sunny

    • 65
    • 80

    Chance Rain Showers

    • 60
    • 80

    Chance Rain Showers

    • 63
    • 76

    Partly Sunny

Today 9 Sep Ontario

A chance of Showers late this Morning, then Showers with a chance of Thunderstorms this afternoon. Highs Ranging from the mid 70s on the Hilltops to the upper 70s across the lower Elevations. Southwest Winds 5 to 10 Mph, increasing to 10 to 15 Mph. Chance of rain 80 percent.

Tonight 9 Sep Ontario

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers and Thunderstorms overnight. Warm and muggy with Lows in the mid 60s. Southwest Winds 10 to 15 Mph, becoming west 5 to 10 Mph. Chance of rain 90 percent.

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Grammar Airport Temperature Statistics

September Temperature

Penn Yan, Penn Yan Airport (16.2 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    69 °F

  • Highest 1 September, 2026

    82.9 °F

Climate (2021–2026)

Penn Yan, Penn Yan Airport (16.2 miles)

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  • Average Low 2021–2026

    41.7 °F

  • Average 2021–2026

    50.3 °F

  • Average High 2021–2026

    59 °F
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