Upper Sioux Agency State Park Weather Forecast

    • 49
    • 70

    Becoming Sunny

    • 51
    • 69

    Rain Showers

    • 46
    • 68

    Mostly Sunny

    • 51
    • 67

    Chance Rain Showers

    • 52
    • 71

    Chance Rain Showers

    • 51
    • 73

    Slight Chance Thunderstorms

Today 13 Sep Yellow Medicine

Cloudy with a 40 percent chance of rain Showers early in the Morning, then mostly sunny in the late morning and afternoon. Highs around 70. North Winds up to 5 Mph.

Tonight 13 Sep Yellow Medicine

Mostly clear. Lows in the lower 50s. Southeast Winds up to 10 Mph. Gusts up to 25 Mph after midnight.

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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 10 September, 2026

    50.5 °F

  • Average September

    73.9 °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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