Crystal Lake Weather Forecast

    • 57
    • 79

    Mostly Sunny

    • 45
    • 74

    Mostly Sunny

    • 52
    • 71

    Partly Sunny

    • 56
    • 67

    Mostly Cloudy

    • 59
    • 73

    Partly Sunny

    • 58
    • 76

    Chance Rain Showers

Today 18 Sep Sullivan

Sunny. Highs in the upper 70s. Northwest Winds around 5 Mph.

Tonight 18 Sep Sullivan

Mostly clear. Lows in the mid 50s. Northwest Winds around 5 Mph.

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  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (14.3 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    64.8 °F

  • Highest 13 September, 2025

    86 °F

Climate (2020–Present)

Williamsport - Lycoming County Airport (14.3 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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