Upper Sioux Agency State Park Weather Forecast

    • 58
    • 63

    Rain Showers Likely

    • 57
    • 67

    Rain Showers Likely

    • 57
    • 66

    Chance Rain Showers

    • 56
    • 71

    Partly Sunny

    • 56
    • 71

    Chance Rain Showers

Today 24 Sep Yellow Medicine

Cooler. Patchy fog in the morning. Rain Showers and slight chance of Thunderstorms in the Morning, then chance of rain Showers in the afternoon. Near steady temperature in the upper 50s. South Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation near 100 percent.

Tonight 24 Sep Yellow Medicine

Cloudy. Patchy drizzle. Near steady temperature in the upper 50s. Southeast Winds 5 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 16 September, 2026

    44.6 °F

  • Average September

    67.3 °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

    58.4 °F
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