Crystal Lake Weather Forecast

    • 49
    • 69

    Sunny

    • 46
    • 68

    Mostly Sunny

    • 47
    • 68

    Mostly Sunny

    • 50
    • 73

    Sunny

    • 55
    • 78

    Mostly Sunny

    • 60
    • 80

    Partly Sunny

    • 60
    • 79

    Chance Rain Showers

Today 31 May Sullivan

Mostly sunny and warmer. Near steady temperature in the upper 60s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 31 May Sullivan

Mostly clear. Lows in the upper 40s. Northwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

May Temperature

Williamsport - Lycoming County Airport (14.3 miles)

  • Lowest 12 May, 2026

    32.6 °F

  • Average May

    59.5 °F

  • Highest 18 May, 2026

    94.6 °F

Climate (2021–Present)

Williamsport - Lycoming County Airport (14.3 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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