Big Sandy Lake Weather Forecast

    • 49
    • 79

    Decreasing Clouds

    • 45
    • 68

    Chance Rain Showers

    • 57
    • 71

    Rain Showers

    • 49
    • 72

    Chance Rain Showers

    • 51
    • 69

    Chance Rain Showers

    • 49
    • 71

    Slight Chance Thunderstorms

Today 12 Sep Monroe

Mostly sunny. Highs in the upper 70s. West Winds 5 to 10 Mph.

Tonight 12 Sep Monroe

Mostly cloudy with a slight chance of Showers and Thunderstorms. Warmer. Near steady temperature in the mid 60s. South Winds 5 to 10 Mph. Chance of rain 20 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 9 September, 2026

    55.6 °F

  • Average September

    73.9 °F

  • Highest 1 September, 2026

    91 °F

Climate (2021–2026)

Sparta, Sparta / Fort McCoy Airport (2.5 miles)

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  • Average Low 2021–2026

    35.3 °F

  • Average 2021–2026

    47.8 °F

  • Average High 2021–2026

    58.5 °F
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