Upper Sioux Agency State Park Weather Forecast

    • 63
    • 81

    Rain Showers

    • 62
    • 78

    Rain Showers Likely

    • 59
    • 73

    Rain Showers Likely

    • 60
    • 76

    Chance Rain Showers

    • 59
    • 80

    Partly Sunny

    • 55
    • 78

    Slight Chance Thunderstorms

Today 17 Sep Yellow Medicine

Partly sunny. Chance of Showers in the Morning, then chance of Thunderstorms in the afternoon. Highs in the lower 80s. North Winds up to 5 Mph shifting to the southeast in the afternoon. Chance of precipitation 50 percent.

Tonight 17 Sep Yellow Medicine

Mostly clear. Lows in the lower 60s. Northwest Winds up to 5 Mph.

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Upper Sioux Agency State Park Temperature Statistics

September Temperature

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

  • Lowest 7 September, 2025

    37.4 °F

  • Average September

    63.7 °F

  • Highest 14 September, 2025

    89.8 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    36.9 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    57.9 °F
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