Upper Sioux Agency State Park Weather Forecast

    • 60
    • 84

    Chance Thunderstorms

    • 58
    • 82

    Mostly Sunny

    • 53
    • 79

    Partly Sunny

    • 59
    • 80

    Partly Sunny

    • 63
    • 81

    Slight Chance Thunderstorms

    • 60
    • 83

    Mostly Sunny

Today 20 Aug Yellow Medicine

Partly sunny with a 20 percent chance of Thunderstorms. Highs in the mid 80s. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph.

Tonight 20 Aug Yellow Medicine

Partly cloudy. Lows in the upper 50s. West Winds 5 to 10 Mph.

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Upper Sioux Agency State Park Temperature Statistics

August Temperature

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

  • Lowest 5 August, 2026

    50.5 °F

  • Average August

    72.1 °F

  • Highest 12 August, 2026

    85.3 °F

Climate (2021–2026)

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

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  • Average Low 2021–2026

    37.4 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    58.4 °F
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