Lake Koshkonong Weather Forecast

    • 58
    • 83

    Sunny

    • 62
    • 85

    Mostly Sunny

    • 67
    • 86

    Partly Sunny

    • 64
    • 84

    Rain Showers Likely

    • 61
    • 81

    Slight Chance Rain Showers

    • 62
    • 83

    Partly Sunny

Today 6 Jul Jefferson

Sunny. Highs in the lower 80s. Northeast Winds up to 10 Mph.

Tonight 6 Jul Jefferson

Clear. Lows in the upper 50s. East Winds up to 5 Mph through around midnight becoming calm.

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Lake Koshkonong Temperature Statistics

July Temperature

Watertown (20.5 miles)

  • Lowest 2 July, 2026

    67.3 °F

  • Average July

    80.5 °F

  • Highest 1 July, 2026

    91.6 °F

Climate (2021–2026)

Watertown (20.5 miles)

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  • Average Low 2021–2026

    35.2 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    53.9 °F
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