Clear Lake Weather Forecast

    • 63
    • 87

    Slight Chance Thunderstorms

    • 63
    • 88

    Rain Showers Likely

    • 41
    • 80

    Rain Showers

    • 41
    • 62

    Partly Sunny

    • 43
    • 62

    Chance Rain Showers

    • 47
    • 61

    Chance Rain Showers

Today 18 May Sullivan

Mostly sunny. Highs around 90. Southeast Winds around 5 Mph, becoming southwest with Gusts up to 20 Mph this afternoon.

Tonight 18 May Sullivan

Mostly clear. Lows in the mid 60s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

May Temperature

Monticello, Sullivan County International Airport (18.6 miles)

  • Lowest 4 May, 2026

    30.9 °F

  • Average May

    50.7 °F

  • Highest 5 May, 2026

    78.1 °F

Climate (2021–Present)

Monticello, Sullivan County International Airport (18.6 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    55 °F
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