Upper Sioux Agency State Park Weather Forecast

    • 57
    • 74

    Chance Rain Showers

    • 59
    • 78

    Rain Showers

    • 55
    • 70

    Rain Showers

    • 52
    • 69

    Chance Rain Showers

    • 52
    • 67

    Chance Rain Showers

    • 51
    • 67

    Slight Chance Rain Showers

Today 16 Sep Yellow Medicine

Increasing Clouds. Near steady temperature in the lower 70s. Southeast Winds 5 to 10 Mph.

Tonight 16 Sep Yellow Medicine

Warmer, cloudy. Chance of rain Showers in the Evening, then slight chance of rain Showers after midnight. Lows in the upper 50s. Southeast Winds up to 10 Mph. Chance of Showers 40 percent.

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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 13 September, 2026

    47.1 °F

  • Average September

    70.7 °F

  • Highest 3 September, 2026

    92.8 °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

    37.5 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    58.5 °F
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