Williamsport Regional Airport Weather Forecast

    • 58
    • 74

    Chance Rain Showers

    • 58
    • 85

    Mostly Sunny

    • 48
    • 81

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 58
    • 75

    Mostly Cloudy

    • 59
    • 80

    Partly Sunny

    • 60
    • 83

    Slight Chance Rain Showers

Today 17 Sep Southern Lycoming

Partly sunny. Near steady temperature in the lower 70s. East Winds around 5 Mph.

Tonight 17 Sep Southern Lycoming

Partly cloudy. Patchy dense fog. Lows in the upper 50s. East Winds around 5 Mph late this Evening, becoming light and variable.

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Williamsport Regional Airport Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (0 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 (0 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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