Grammar Airport Weather Forecast

    • 44
    • 66

    Sunny

    • 44
    • 66

    Mostly Sunny

    • 48
    • 67

    Mostly Sunny

    • 49
    • 68

    Partly Sunny

    • 48
    • 65

    Slight Chance Rain Showers

    • 49
    • 67

    Mostly Sunny

Today 23 Sep Ontario

Sunny. Highs Ranging from around 60 on the Hilltops to the mid 60s across the lower Elevations. Light Winds, becoming east around 10 Mph.

Tonight 23 Sep Ontario

Mainly clear. Lows in the mid 40s. East Winds 10 Mph or less.

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Grammar Airport Temperature Statistics

September Temperature

Penn Yan, Penn Yan Airport (16.2 miles)

  • Lowest 19 September, 2026

    43 °F

  • Average September

    65.7 °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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