Big Sandy Lake Weather Forecast

    • 61
    • 84

    Chance Thunderstorms

    • 58
    • 78

    Rain Showers Likely

    • 59
    • 75

    Chance Thunderstorms

    • 59
    • 77

    Chance Thunderstorms

    • 57
    • 77

    Chance Rain Showers

    • 54
    • 74

    Slight Chance Rain Showers

Today 18 Sep Monroe

Mostly cloudy this Morning, then becoming partly sunny. A slight chance of Showers. A slight chance of Thunderstorms this afternoon. Highs in the lower 80s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 18 Sep Monroe

Mostly cloudy with a chance of Showers. A chance of Thunderstorms in the Evening, then a slight chance of Thunderstorms after midnight. Lows around 60. East Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sandy Lake Temperature Statistics

September Temperature

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

  • Lowest 7 September, 2025

    32.9 °F

  • Average September

    61.3 °F

  • Highest 16 September, 2025

    87.1 °F

Climate (2020–Present)

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

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  • Average Low 2020–2025

    34.5 °F

  • Average 2020–2025

    47.2 °F

  • Average High 2020–2025

    57.9 °F
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