Lake Koshkonong Weather Forecast

    • 3
    • 9

    Cold

    • -3
    • 12

    Partly Sunny

    • -6
    • 12

    Partly Sunny

    • -4
    • 11

    Mostly Sunny

    • -1
    • 13

    Mostly Sunny

    • 6
    • 19

    Partly Sunny

Today 26 Jan Jefferson

Bitterly cold. Sunny. Highs around 9. West Winds 10 to 15 Mph. Lowest wind chill Readings 15 below to 25 below zero until late afternoon.

Tonight 26 Jan Jefferson

Partly cloudy in the evening then becoming mostly cloudy. Chance of Flurries after midnight. Lows around 3. Southwest Winds 10 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Koshkonong Temperature Statistics

January Temperature

Watertown (20.5 miles)

  • Lowest 23 January, 2026

    -17.5 °F

  • Average January

    21 °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

    54.5 °F
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