Upper Sioux Agency State Park Weather Forecast

    • 60
    • 82

    Chance Thunderstorms

    • 55
    • 77

    Chance Rain Showers

    • 56
    • 77

    Partly Sunny

    • 61
    • 81

    Chance Rain Showers

    • 58
    • 82

    Mostly Sunny

    • 57
    • 79

    Partly Sunny

Today 17 Aug Yellow Medicine

Sunny. A 30 percent chance of Thunderstorms late in the afternoon. Highs in the lower 80s. Southwest Winds 5 to 15 Mph.

Tonight 17 Aug Yellow Medicine

Partly cloudy with a 40 percent chance of Thunderstorms in the Evening, then mostly cloudy after midnight. Lows in the lower 60s. Southwest Winds up to 10 Mph.

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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

    72.2 °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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