Upper Sioux Agency State Park Weather Forecast

    • 57
    • 72

    Rain Showers

    • 56
    • 63

    Rain Showers

    • 54
    • 66

    Mostly Cloudy

    • 52
    • 66

    Chance Rain Showers

    • 48
    • 61

    Chance Rain Showers

    • 48
    • 64

    Mostly Cloudy

    • 54
    • 67

    Slight Chance Thunderstorms

Today 17 Sep Yellow Medicine

Partly sunny. A 40 percent chance of rain Showers in the morning. Highs in the lower 70s.

Tonight 17 Sep Yellow Medicine

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms late in the night. Lows in the upper 50s. East Winds 5 to 10 Mph. Chance of precipitation 50 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

    70.1 °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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