Lake Koshkonong Weather Forecast

    • 30
    • 49

    Rain

    • 22
    • 34

    Snow

    • 23
    • 34

    Chance Snow

    • 16
    • 29

    Mostly Cloudy

    • 16
    • 29

    Partly Sunny

    • 29
    • 38

    Mostly Cloudy

Today 19 Feb Jefferson

Mostly sunny in the late morning and early afternoon then becoming mostly cloudy. A 50 percent chance of light rain Showers late in the afternoon. Highs around 50. North Winds up to 10 Mph.

Tonight 19 Feb Jefferson

Rain through the night. Slight chance of light snow after Midnight, then light snow early in the morning. Snow accumulation up to 1 inch. Lows in the lower 30s. North Winds 10 to 15 Mph. Gusts up to 30 Mph after midnight. Chance of precipitation 90 percent.

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Lake Koshkonong Temperature Statistics

February Temperature

Watertown (20.5 miles)

  • Lowest 4 February, 2026

    -5.6 °F

  • Average February

    27 °F

  • Highest 16 February, 2026

    60.6 °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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