Upper Sioux Agency State Park Weather Forecast

    • 57
    • 81

    Chance Rain Showers

    • 59
    • 81

    Mostly Sunny

    • 62
    • 84

    Chance Thunderstorms

    • 58
    • 82

    Mostly Sunny

    • 57
    • 79

    Partly Sunny

    • 60
    • 79

    Partly Sunny

Today 18 Aug Yellow Medicine

Mostly sunny. Slight chance of Thunderstorms late in the morning. Slight chance of Thunderstorms late in the afternoon. Highs in the upper 70s. Northwest Winds up to 10 Mph. Chance of Thunderstorms 20 percent.

Tonight 18 Aug Yellow Medicine

Mostly clear. Lows in the mid 50s. North Winds up to 5 Mph shifting to the southwest after midnight.

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Upper Sioux Agency State Park Temperature Statistics

August Temperature

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

  • Lowest 5 August, 2026

    50.5 °F

  • Average August

    72.1 °F

  • Highest 12 August, 2026

    85.3 °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

    58.4 °F
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