Sullivan Weather Forecast

    • 10
    • 24

    Partly Sunny

    • 26
    • 31

    Slight Chance Snow

    • 8
    • 36

    Partly Sunny

    • 19
    • 26

    Slight Chance Snow

    • 19
    • 32

    Mostly Cloudy

    • 27
    • 38

    Mostly Cloudy

Today 4 Feb Jefferson

Sunny. Highs in the mid 20s. Northwest Winds up to 5 Mph.

Tonight 4 Feb Jefferson

Mostly clear through around midnight then becoming mostly cloudy. Lows around 10. Calm Winds becoming southwest up to 5 Mph after midnight.

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Sullivan Temperature Statistics

February Temperature

Watertown (12.4 miles)

  • Lowest 1 February, 2026

    -3.1 °F

  • Average February

    17.8 °F

  • Highest 1 February, 2026

    27.5 °F

Climate (2021–Present)

Watertown (12.4 miles)

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  • Average Low 2021–2026

    35.5 °F

  • Average 2021–2026

    45.3 °F

  • Average High 2021–2026

    54.4 °F
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