Grimesville Weather Forecast

    • 59
    • 76

    Slight Chance Rain Showers

    • 62
    • 77

    Chance Rain Showers

    • 48
    • 77

    Rain Showers Likely

    • 45
    • 69

    Partly Sunny

    • 46
    • 65

    Chance Rain Showers

    • 38
    • 63

    Mostly Sunny

Today 30 Sep Southern Lycoming

Patchy dense fog this morning. Mostly cloudy. Highs in the mid 70s. Light and variable Winds, becoming southwest around 5 Mph this afternoon.

Tonight 30 Sep Southern Lycoming

Mostly cloudy. A slight chance of Showers after midnight. Patchy fog after midnight. Lows in the upper 50s. South Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grimesville Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (7.5 miles)

  • Lowest 24 September, 2026

    41.6 °F

  • Average September

    67.5 °F

  • Highest 1 September, 2026

    92.6 °F

Climate (2021–2026)

Williamsport - Lycoming County Airport (7.5 miles)

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  • Average Low 2021–2026

    43.5 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    63.3 °F
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