Upper Sioux Agency State Park Weather Forecast

    • 57
    • 64

    Rain Showers

    • 55
    • 72

    Mostly Cloudy

    • 59
    • 72

    Rain Showers Likely

    • 55
    • 68

    Chance Rain Showers

    • 52
    • 68

    Chance Rain Showers

    • 52
    • 67

    Slight Chance Rain Showers

Today 26 Sep Yellow Medicine

Rain Showers in the Morning, then chance of rain Showers in the afternoon. Highs in the mid 60s. Southeast Winds 10 to 15 Mph. Chance of Showers near 100 percent.

Tonight 26 Sep Yellow Medicine

Mostly cloudy. Patchy fog after midnight. Lows in the upper 50s. Southeast Winds up 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

    66.6 °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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