Crystal Lake Weather Forecast

    • 62
    • 80

    Isolated Thunderstorms

    • 65
    • 84

    Slight Chance Thunderstorms

    • 65
    • 84

    Partly Sunny

    • 44
    • 74

    Rain Showers

    • 44
    • 61

    Partly Sunny

    • 48
    • 62

    Rain Showers Likely

    • 52
    • 63

    Rain Showers Likely

Today 17 May Sullivan

Sunny. Very warm. Near steady temperature around 80. West Winds around 5 Mph.

Tonight 17 May Sullivan

Partly cloudy. Isolated Showers this evening. Lows in the lower 60s. Southwest Winds around 5 Mph. Chance of rain 20 percent.

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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

    53.9 °F

  • Highest 5 May, 2026

    81.6 °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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