Upper Sioux Agency State Park Weather Forecast

    • 60
    • 82

    Chance Thunderstorms

    • 63
    • 81

    Partly Sunny

    • 61
    • 81

    Slight Chance Thunderstorms

    • 58
    • 79

    Partly Sunny

    • 55
    • 74

    Partly Sunny

Today 9 Aug Yellow Medicine

Mostly cloudy with a 50 percent chance of Thunderstorms in the Morning, then mostly sunny in the afternoon. Highs in the lower 80s. West Winds up to 10 Mph shifting to the north in the afternoon.

Tonight 9 Aug Yellow Medicine

Mostly cloudy. Lows in the lower 60s. Northeast Winds up to 5 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

    70.9 °F

  • Highest 3 August, 2026

    85.1 °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

    58.5 °F
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