Grammar Airport Weather Forecast

    • 38
    • 74

    Rain Showers

    • 28
    • 46

    Rain/Snow Likely

    • 26
    • 40

    Slight Chance Rain/Snow

    • 40
    • 56

    Mostly Cloudy

    • 37
    • 57

    Partly Sunny

    • 44
    • 61

    Partly Sunny

Today 18 Apr Ontario

Mostly sunny through early Afternoon, then mostly cloudy with a chance of Showers late. Warm with Highs Ranging from around 70 on the Hilltops to the mid 70s across the lower Elevations. South Winds 10 to 20 Mph with Gusts up to 35 Mph. Chance of rain 50 percent.

Tonight 18 Apr Ontario

Showers. Locally heavy rainfall possible in the evening. Cooler with Lows in the upper 30s. Southwest Winds 10 to 20 Mph with Gusts up to 35 Mph, becoming northwest. Chance of rain 90 percent.

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Grammar Airport Temperature Statistics

April Temperature

Penn Yan, Penn Yan Airport (16.2 miles)

  • Lowest 8 April, 2026

    18 °F

  • Average April

    47.4 °F

  • Highest 15 April, 2026

    79 °F

Climate (2021–Present)

Penn Yan, Penn Yan Airport (16.2 miles)

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  • Average Low 2021–2026

    41.8 °F

  • Average 2021–2026

    50.4 °F

  • Average High 2021–2026

    59.1 °F
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