Crystal Lake Weather Forecast

    • 51
    • 70

    Increasing Clouds

    • 57
    • 73

    Partly Sunny

    • 64
    • 76

    Chance Rain Showers

    • 53
    • 72

    Chance Rain Showers

    • 53
    • 69

    Mostly Sunny

    • 59
    • 71

    Partly Sunny

Today 7 Sep Sullivan

Patchy dense fog this morning. Sunny. Highs in the lower 70s. North Winds around 5 Mph.

Tonight 7 Sep Sullivan

Partly cloudy. Patchy dense fog after midnight. Lows around 50. North Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (14.3 miles)

  • Lowest 1 September, 2026

    68.6 °F

  • Average September

    77.3 °F

  • Highest 1 September, 2026

    92.6 °F

Climate (2021–2026)

Williamsport - Lycoming County Airport (14.3 miles)

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  • Average Low 2021–2026

    43.5 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    63.3 °F
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