Crystal Lake Weather Forecast

    • 45
    • 64

    Becoming Sunny

    • 53
    • 66

    Mostly Sunny

    • 61
    • 73

    Mostly Cloudy

    • 62
    • 75

    Chance Rain Showers

    • 56
    • 72

    Slight Chance Thunderstorms

    • 56
    • 70

    Chance Rain Showers

Today 14 Sep Sullivan

Mostly sunny. Cooler with Highs in the mid 60s. North Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 14 Sep Sullivan

Mostly clear. Cooler with Lows in the mid 40s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (14.3 miles)

  • Lowest 7 September, 2026

    52.6 °F

  • Average September

    72.9 °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

    43.6 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    63.3 °F
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