Lake Koshkonong Weather Forecast

    • 41
    • 66

    Sunny

    • 43
    • 63

    Sunny

    • 51
    • 72

    Mostly Sunny

    • 46
    • 70

    Partly Sunny

    • 46
    • 67

    Partly Sunny

    • 47
    • 67

    Mostly Sunny

Today 4 Oct Jefferson

Sunny. Highs in the mid 60s. Northwest Winds 5 to 15 Mph.

Tonight 4 Oct Jefferson

Clear. Lows around 40. Northwest Winds up to 5 Mph.

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Lake Koshkonong Temperature Statistics

October Temperature

Watertown (20.5 miles)

  • Lowest 2 October, 2026

    39.7 °F

  • Average October

    57.1 °F

  • Highest 1 October, 2026

    64.4 °F

Climate (2021–2026)

Watertown (20.5 miles)

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  • Average Low 2021–2026

    35.2 °F

  • Average 2021–2026

    44.8 °F

  • Average High 2021–2026

    53.8 °F
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