Upper Sioux Agency State Park Weather Forecast

    • 64
    • 81

    Slight Chance Thunderstorms

    • 62
    • 86

    Becoming Sunny

    • 55
    • 79

    Mostly Sunny

    • 53
    • 80

    Mostly Sunny

    • 64
    • 82

    Chance Thunderstorms

    • 66
    • 83

    Chance Rain Showers

    • 64
    • 85

    Chance Rain Showers

Today 24 Aug Yellow Medicine

Mostly sunny. Highs in the lower 80s. South Winds 10 to 15 Mph.

Tonight 24 Aug Yellow Medicine

Partly cloudy in the Evening, then mostly cloudy with slight chance of Thunderstorms after midnight. Mostly cloudy with chance of Thunderstorms late in the night. Lows in the mid 60s. South Winds 5 to 15 Mph. Chance of Thunderstorms 40 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

    71.4 °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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