Upper Sioux Agency State Park Weather Forecast

    • 57
    • 83

    Becoming Sunny

    • 52
    • 77

    Mostly Sunny

    • 62
    • 81

    Sunny

    • 55
    • 83

    Chance Thunderstorms

    • 51
    • 74

    Chance Rain Showers

    • 51
    • 69

    Chance Rain Showers

Today 8 Sep Yellow Medicine

Mostly cloudy with a 20 percent chance of Thunderstorms in the Morning, then mostly sunny in the afternoon. Highs in the mid 80s. South Winds 5 to 10 Mph with Gusts to around 35 Mph shifting to the west 5 to 15 Mph in the afternoon.

Tonight 8 Sep Yellow Medicine

Mostly cloudy. Chance of Showers and slight chance of Thunderstorms after Midnight, then slight chance of Thunderstorms early in the morning. Near steady temperature in the lower 70s. South Winds 10 to 20 Mph with Gusts to around 35 Mph. Chance of precipitation 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 1 September, 2026

    57 °F

  • Average September

    75.8 °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

    37.4 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    58.5 °F
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