Upper Sioux Agency State Park Weather Forecast

    • 68
    • 91

    Mostly Sunny

    • 69
    • 90

    Chance Thunderstorms

    • 68
    • 86

    Chance Rain Showers

    • 69
    • 84

    Chance Rain Showers

    • 63
    • 85

    Chance Rain Showers

Today 4 Sep Yellow Medicine

Sunny. Highs in the lower 90s. North Winds up to 5 Mph shifting to the northeast in the afternoon.

Tonight 4 Sep Yellow Medicine

Mostly clear. Lows in the upper 60s. East Winds up to 10 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 1 September, 2026

    57 °F

  • Average September

    71.7 °F

  • Highest 1 September, 2026

    82.4 °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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