Crystal Lake Weather Forecast

    • 49
    • 62

    Chance Rain Showers

    • 46
    • 56

    Chance Rain Showers

    • 44
    • 58

    Mostly Cloudy

    • 44
    • 58

    Partly Sunny

    • 46
    • 60

    Slight Chance Rain Showers

    • 47
    • 58

    Partly Sunny

Today 21 Sep Sullivan

Partly sunny this Morning, then becoming mostly cloudy. Highs in the mid 60s. Northeast Winds 5 to 10 Mph with Gusts up to 25 Mph.

Tonight 21 Sep Sullivan

Cloudy. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the upper 40s. Northeast Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (14.3 miles)

  • Lowest 15 September, 2026

    47.6 °F

  • Average September

    71.1 °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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