Opitz Lake Weather Forecast

    • 62
    • 85

    Chance Thunderstorms

    • 53
    • 77

    Slight Chance Thunderstorms

    • 47
    • 66

    Mostly Sunny

    • 44
    • 62

    Mostly Sunny

    • 47
    • 64

    Mostly Sunny

    • 51
    • 68

    Mostly Sunny

Today 21 Aug Marshall

Mostly sunny early this Morning, then becoming partly sunny. A chance of Thunderstorms this afternoon. Humid with Highs in the upper 80s. South Winds 10 to 15 Mph, becoming southwest this afternoon. Chance of rain 30 percent.

Tonight 21 Aug Marshall

Partly cloudy. A chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Humid with Lows in the lower 60s. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 40 percent.

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Opitz Lake Temperature Statistics

August Temperature

Sisseton, Sisseton Municipal Airport (24.9 miles)

  • Lowest 2 August, 2025

    51.7 °F

  • Average August

    70.8 °F

  • Highest 11 August, 2025

    86.6 °F

Climate (2020–Present)

Sisseton, Sisseton Municipal Airport (24.9 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    46.6 °F

  • Average High 2020–2025

    57 °F
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