Upper Sioux Agency State Park Weather Forecast

    • 60
    • 80

    Becoming Sunny

    • 61
    • 84

    Chance Thunderstorms

    • 60
    • 83

    Mostly Sunny

    • 56
    • 80

    Partly Sunny

    • 60
    • 80

    Partly Sunny

    • 63
    • 83

    Slight Chance Thunderstorms

Today 19 Aug Yellow Medicine

Mostly sunny. Highs around 80. Southwest Winds up to 10 Mph.

Tonight 19 Aug Yellow Medicine

Clear. 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 °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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