Grimesville Weather Forecast

    • 12
    • 25

    Chance Snow Showers

    • 18
    • 30

    Partly Sunny

    • 21
    • 43

    Mostly Cloudy

    • 31
    • 45

    Rain Showers

    • 20
    • 39

    Mostly Cloudy

    • 28
    • 35

    Slight Chance Freezing Rain

Today 15 Dec Southern Lycoming

Cloudy with a 40 percent chance of snow Showers. Highs in the mid 20s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 15 Dec Southern Lycoming

Mostly cloudy in the Evening, then becoming partly cloudy. Lows around 10. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grimesville Temperature Statistics

December Temperature

Williamsport - Lycoming County Airport (7.5 miles)

  • Lowest 9 December, 2025

    6.1 °F

  • Average December

    27.2 °F

  • Highest 1 December, 2025

    37 °F

Climate (2020–Present)

Williamsport - Lycoming County Airport (7.5 miles)

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  • Average Low 2020–2025

    43.8 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    63.2 °F
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