Big Sandy Lake Weather Forecast

    • 65
    • 83

    Mostly Cloudy

    • 61
    • 84

    Thunderstorms Likely

    • 57
    • 81

    Partly Sunny

    • 59
    • 83

    Partly Sunny

    • 62
    • 87

    Partly Sunny

    • 64
    • 87

    Chance Rain Showers

    • 63
    • 85

    Chance Thunderstorms

Today 3 Jul Monroe

Partly sunny. Highs in the lower 80s. Light Winds.

Tonight 3 Jul Monroe

Mostly cloudy. Lows in the mid 60s. Southwest Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sandy Lake Temperature Statistics

July Temperature

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

  • Lowest 1 July, 2026

    69.6 °F

  • Average July

    75.9 °F

  • Highest 1 July, 2026

    84.2 °F

Climate (2021–2026)

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

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  • Average Low 2021–2026

    34.9 °F

  • Average 2021–2026

    47.5 °F

  • Average High 2021–2026

    58.2 °F
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