Lake Koshkonong Weather Forecast

    • -2
    • 13

    Mostly Sunny

    • 3
    • 15

    Partly Sunny

    • 2
    • 20

    Mostly Sunny

    • 15
    • 25

    Snow Likely

    • 11
    • 27

    Mostly Cloudy

    • 12
    • 26

    Chance Snow

Today 29 Jan Jefferson

Sunny. Highs around 13. Northwest Winds 5 to 10 Mph.

Tonight 29 Jan Jefferson

Partly cloudy. Lows around 2 below. North Winds up to 5 Mph.

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Lake Koshkonong Temperature Statistics

January Temperature

Watertown (20.5 miles)

  • Lowest 23 January, 2026

    -17.5 °F

  • Average January

    18.3 °F

  • Highest 9 January, 2026

    55.2 °F

Climate (2021–Present)

Watertown (20.5 miles)

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  • Average Low 2021–2026

    35.6 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    54.4 °F
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