Lake Koshkonong Weather Forecast

    • 32
    • 39

    Increasing Clouds

    • 28
    • 40

    Rain Likely

    • 34
    • 44

    Partly Sunny

    • 31
    • 45

    Chance Rain

    • 26
    • 40

    Chance Snow

    • 16
    • 32

    Chance Snow

Today 5 Jan Jefferson

Mostly cloudy. Patchy fog and freezing fog in the morning. Highs in the upper 30s. West Winds up to 10 Mph.

Tonight 5 Jan Jefferson

Not as cold. Mostly clear. Near steady temperature in the upper 20s. Southwest Winds 5 to 15 Mph.

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Lake Koshkonong Temperature Statistics

January Temperature

Watertown (20.5 miles)

  • Lowest 1 January, 2026

    6.1 °F

  • Average January

    12.3 °F

  • Highest 2 January, 2026

    17.2 °F

Climate (2021–Present)

Watertown (20.5 miles)

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  • Average Low 2021–2026

    35.7 °F

  • Average 2021–2026

    45.5 °F

  • Average High 2021–2026

    54.5 °F
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