Upper Sioux Agency State Park Weather Forecast

    • 64
    • 83

    Chance Thunderstorms

    • 62
    • 80

    Chance Thunderstorms

    • 59
    • 76

    Slight Chance Thunderstorms

    • 60
    • 74

    Rain Showers Likely

    • 58
    • 73

    Slight Chance Thunderstorms

    • 56
    • 74

    Partly Sunny

Today 11 Aug Yellow Medicine

Partly sunny. Patchy fog in the morning. Highs in the lower 80s. East Winds up to 5 Mph.

Tonight 11 Aug Yellow Medicine

Cloudy with chance of Showers and slight chance of Thunderstorms. Lows in the mid 60s. East Winds up to 5 Mph. Chance of precipitation 50 percent.

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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

    70.6 °F

  • Highest 3 August, 2026

    85.1 °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

    58.5 °F
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