Muncy Valley Weather Forecast

    • 54
    • 79

    Increasing Clouds

    • 56
    • 73

    Slight Chance Rain

    • 56
    • 82

    Mostly Sunny

    • 48
    • 78

    Mostly Sunny

    • 52
    • 75

    Partly Sunny

    • 54
    • 74

    Mostly Cloudy

Today 16 Sep Sullivan

Partly sunny. Highs in the mid 70s. Northeast Winds around 5 Mph.

Tonight 16 Sep Sullivan

Mostly cloudy. Lows in the lower 50s. East Winds around 5 Mph.

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Muncy Valley Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (18.6 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    64.3 °F

  • Highest 13 September, 2025

    86 °F

Climate (2020–Present)

Williamsport - Lycoming County Airport (18.6 miles)

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  • Average Low 2020–2025

    43.9 °F

  • Average 2020–2025

    53.1 °F

  • Average High 2020–2025

    63.3 °F
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