Big Sandy Lake Weather Forecast

    • 30
    • 35

    Increasing Clouds

    • 4
    • 39

    Rain Likely

    • 15
    • 23

    Slight Chance Snow

    • 5
    • 32

    Partly Sunny

    • 10
    • 20

    Mostly Cloudy

    • 22
    • 31

    Mostly Cloudy

Today 17 Dec Monroe

Mostly sunny. Highs in the mid 30s. West Winds 5 to 10 Mph, becoming south in the afternoon.

Tonight 17 Dec Monroe

Cloudy. Rain after midnight. Lows in the upper 20s. Temperature rising into the mid 30s after midnight. South Winds 10 to 20 Mph with Gusts up to 40 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sandy Lake Temperature Statistics

December Temperature

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

  • Lowest 4 December, 2025

    -12.3 °F

  • Average December

    14.8 °F

  • Highest 9 December, 2025

    30.2 °F

Climate (2020–Present)

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

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  • Average Low 2020–2025

    34.7 °F

  • Average 2020–2025

    47.4 °F

  • Average High 2020–2025

    58 °F
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