Beloit Weather Forecast

    • 30
    • 40

    Increasing Clouds

    • 28
    • 47

    Partly Sunny

    • 30
    • 40

    Mostly Cloudy

    • 35
    • 46

    Mostly Cloudy

    • 27
    • 54

    Mostly Cloudy

    • 25
    • 42

    Partly Sunny

Today 21 Dec Lyon

Mostly sunny. Highs in the upper 30s. South Winds 10 to 15 Mph.

Tonight 21 Dec Lyon

Mostly clear and Colder. Near steady temperature around 16. Southeast Winds around 5 Mph.

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Beloit Temperature Statistics

December Temperature

Sioux Falls, Foss Field (21.7 miles)

  • Lowest 14 December, 2025

    -11.9 °F

  • Average December

    19 °F

  • Highest 9 December, 2025

    44.1 °F

Climate (2020–Present)

Sioux Falls, Foss Field (21.7 miles)

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  • Average Low 2020–2025

    38.9 °F

  • Average 2020–2025

    49.9 °F

  • Average High 2020–2025

    60.6 °F
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