Williamsport Weather Forecast

    • 59
    • 86

    Mostly Sunny

    • 51
    • 82

    Mostly Sunny

    • 54
    • 77

    Partly Sunny

    • 59
    • 76

    Mostly Cloudy

    • 59
    • 81

    Partly Sunny

    • 59
    • 83

    Partly Sunny

Today 18 Sep Southern Lycoming

Patchy dense fog in the morning. Sunny, warmer with Highs in the mid 80s. Northwest Winds around 5 Mph.

Tonight 18 Sep Southern Lycoming

Mostly clear. Patchy fog. Lows in the mid 50s. Light and variable Winds.

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Williamsport Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (3.7 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    64.6 °F

  • Highest 13 September, 2025

    86 °F

Climate (2020–Present)

Williamsport - Lycoming County Airport (3.7 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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