Williamsport Weather Forecast

    • 63
    • 87

    Chance Thunderstorms

    • 66
    • 91

    Partly Sunny

    • 68
    • 91

    Partly Sunny

    • 49
    • 83

    Rain Showers

    • 48
    • 68

    Mostly Cloudy

    • 50
    • 68

    Chance Rain Showers

Today 17 May Southern Lycoming

Mostly sunny. A chance of Showers and Thunderstorms this afternoon. Very warm with Highs in the mid 80s. West Winds around 5 Mph. Chance of rain 30 percent.

Tonight 17 May Southern Lycoming

A slight chance of Thunderstorms in the evening. Partly cloudy with a slight chance of Showers. Lows in the lower 60s. Southwest 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

Williamsport Temperature Statistics

May Temperature

Williamsport - Lycoming County Airport (3.7 miles)

  • Lowest 12 May, 2026

    32.6 °F

  • Average May

    53.9 °F

  • Highest 5 May, 2026

    81.6 °F

Climate (2021–Present)

Williamsport - Lycoming County Airport (3.7 miles)

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  • Average Low 2021–2026

    43.6 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    63.2 °F
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