Big Sandy Lake Weather Forecast

    • 52
    • 69

    Mostly Cloudy

    • 54
    • 67

    Mostly Cloudy

    • 53
    • 73

    Partly Sunny

    • 57
    • 70

    Chance Rain Showers

    • 54
    • 68

    Chance Rain Showers

    • 49
    • 69

    Chance Rain Showers

Today 26 Sep Monroe

Patchy fog this morning. Partly sunny. Highs in the upper 60s. Southeast Winds 5 to 10 Mph.

Tonight 26 Sep Monroe

Mostly cloudy. A slight chance of Showers after midnight. Lows in the lower 50s. Light Winds. 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 14 September, 2026

    36.9 °F

  • Average September

    65.6 °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

    58.4 °F
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