Upper Sioux Agency State Park Weather Forecast

    • 63
    • 78

    Chance Rain Showers

    • 65
    • 78

    Chance Thunderstorms

    • 61
    • 80

    Chance Thunderstorms

    • 56
    • 77

    Partly Sunny

    • 59
    • 79

    Partly Sunny

    • 60
    • 80

    Chance Rain Showers

Today 13 Aug Yellow Medicine

Mostly cloudy. Chance of Showers and slight chance of Thunderstorms early in the Morning, then chance of Showers in the morning. Highs in the upper 70s. Northeast Winds up to 10 Mph shifting to the east in the afternoon. Chance of precipitation 50 percent.

Tonight 13 Aug Yellow Medicine

Mostly cloudy. Lows in the lower 60s. East 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

    71.2 °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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