Upper Sioux Agency State Park Weather Forecast

    • 59
    • 80

    Becoming Sunny

    • 51
    • 79

    Mostly Sunny

    • 60
    • 80

    Chance Rain Showers

    • 63
    • 80

    Slight Chance Thunderstorms

    • 61
    • 84

    Partly Sunny

    • 56
    • 82

    Mostly Sunny

    • 60
    • 82

    Partly Sunny

Today 21 Aug Yellow Medicine

Sunny. Highs in the lower 80s. North Winds around 10 Mph.

Tonight 21 Aug Yellow Medicine

Mostly clear. Lows in the upper 50s. Northwest Winds up 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

    71.8 °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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