Upper Sioux Agency State Park Weather Forecast

    • 53
    • 65

    Rain Showers Likely

    • 55
    • 64

    Rain Showers Likely

    • 56
    • 66

    Rain Showers Likely

    • 57
    • 68

    Chance Rain Showers

    • 57
    • 72

    Partly Sunny

    • 55
    • 71

    Chance Rain Showers

Today 23 Sep Yellow Medicine

Partly sunny. Highs in the mid 60s. Southeast Winds 5 to 15 Mph.

Tonight 23 Sep Yellow Medicine

Mostly cloudy. Rain Showers likely after midnight. Lows in the mid 50s. Southeast Winds 10 to 15 Mph. Chance of Showers 70 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 16 September, 2026

    44.6 °F

  • Average September

    68 °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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