Rock Island Lighthouse Weather Forecast

    • 25
    • 27

    Chance Snow Showers

    • 6
    • 34

    Decreasing Clouds

    • -4
    • 10

    Cold

    • 27
    • 30

    Snow Showers

    • 15
    • 39

    Slight Chance Snow Showers

    • 11
    • 24

    Chance Snow

    • 22
    • 31

    Rain/Snow Likely

Today 30 Jan Jefferson

Mostly cloudy with a 30 percent chance of snow Showers. Highs in the upper 20s. South Winds 5 to 10 Mph.

Tonight 30 Jan Jefferson

Mostly cloudy through the early Overnight, then becoming partly cloudy. A chance of snow Showers early. Lows Ranging from the lower 20s across the tug hill to the upper 20s along the lake Ontario shore. South Winds 5 to 10 Mph, becoming southwest 10 to 15 Mph. Chance of snow 30 percent.

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Rock Island Lighthouse Temperature Statistics

January Temperature

Watertown, Watertown International Airport (19.9 miles)

  • Lowest 22 January, 2025

    -14.2 °F

  • Average January

    22.4 °F

  • Highest 1 January, 2025

    41.6 °F

Climate (2020–Present)

Watertown, Watertown International Airport (19.9 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    57.5 °F
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