Lake Koshkonong Weather Forecast

    • 29
    • 43

    Increasing Clouds

    • 43
    • 64

    Rain Showers

    • 42
    • 61

    Rain Showers Likely

    • 35
    • 56

    Partly Sunny

    • 46
    • 59

    Mostly Cloudy

    • 60
    • 73

    Rain Showers Likely

Today 7 Apr Jefferson

Sunny. Highs in the lower 40s. East Winds up to 5 Mph shifting to the southeast in the afternoon.

Tonight 7 Apr Jefferson

Colder, clear. Lows around 20. North Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Koshkonong Temperature Statistics

April Temperature

Watertown (20.5 miles)

  • Lowest 1 April, 2026

    31.8 °F

  • Average April

    39.1 °F

  • Highest 2 April, 2026

    57.2 °F

Climate (2021–Present)

Watertown (20.5 miles)

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  • Average Low 2021–2026

    35.8 °F

  • Average 2021–2026

    45.6 °F

  • Average High 2021–2026

    54.7 °F
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