Upper Sioux Agency State Park Weather Forecast

    • 57
    • 62

    Rain Showers

    • 53
    • 64

    Mostly Cloudy

    • 50
    • 67

    Chance Rain Showers

    • 46
    • 63

    Chance Rain Showers

    • 45
    • 65

    Mostly Cloudy

    • 50
    • 67

    Slight Chance Thunderstorms

Today 18 Sep Yellow Medicine

Partly sunny. Highs in the lower 70s.

Tonight 18 Sep Yellow Medicine

Cloudy. Patchy fog early in the evening. Chance of drizzle and rain Showers early in the Evening, then chance of drizzle in the late evening and overnight. Near steady temperature around 60. Northeast Winds 5 to 15 Mph. Chance of Showers 50 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

    69.6 °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

    58.5 °F
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