Upper Sioux Agency State Park Weather Forecast

    • 51
    • 78

    Mostly Sunny

    • 59
    • 79

    Chance Rain Showers

    • 62
    • 79

    Slight Chance Thunderstorms

    • 61
    • 84

    Partly Sunny

    • 57
    • 81

    Mostly Sunny

    • 58
    • 81

    Partly Sunny

Today 22 Aug Yellow Medicine

Sunny. Near steady temperature in the upper 70s. North Winds 5 to 10 Mph.

Tonight 22 Aug Yellow Medicine

Increasing Clouds. Lows in the lower 50s. North Winds up to 10 Mph shifting to the south after midnight.

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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

    71.6 °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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