Big Sandy Lake Weather Forecast

    • 50
    • 72

    Mostly Sunny

    • 56
    • 76

    Chance Thunderstorms

    • 45
    • 73

    Partly Sunny

    • 47
    • 71

    Partly Sunny

    • 51
    • 72

    Mostly Cloudy

    • 53
    • 73

    Partly Sunny

Today 26 Aug Monroe

Partly cloudy after Midnight, then clearing. A chance of Sprinkles this afternoon. Highs in the lower 70s. West Winds around 5 Mph.

Tonight 26 Aug Monroe

Partly cloudy. A chance of Sprinkles in the evening. Lows around 50. Light Winds.

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Big Sandy Lake Temperature Statistics

August Temperature

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

  • Lowest 1 August, 2025

    44.6 °F

  • Average August

    70.5 °F

  • Highest 15 August, 2025

    91.2 °F

Climate (2020–Present)

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

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  • Average Low 2020–2025

    34.6 °F

  • Average 2020–2025

    47.3 °F

  • Average High 2020–2025

    57.9 °F
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