Lake Geneva Weather Forecast

    • 47
    • 74

    Sunny

    • 54
    • 72

    Partly Sunny

    • 51
    • 77

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

    • 54
    • 76

    Mostly Sunny

Today 21 Dec Western Clay

Sunny. Highs in the lower 70s. North Winds around 5 Mph.

Tonight 21 Dec Western Clay

Mostly clear. Lows in the upper 40s. Northeast Winds 5 to 10 Mph.

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Lake Geneva Temperature Statistics

December Temperature

Keystone Airpark (5 miles)

  • Lowest 15 December, 2025

    35.6 °F

  • Average December

    58.1 °F

  • Highest 5 December, 2025

    80.6 °F

Climate (2020–Present)

Keystone Airpark (5 miles)

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  • Average Low 2020–2025

    58.6 °F

  • Average 2020–2025

    68.6 °F

  • Average High 2020–2025

    80.2 °F
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