Upper Sioux Agency State Park Weather Forecast

    • 52
    • 80

    Sunny

    • 65
    • 84

    Rain Showers

    • 67
    • 85

    Partly Sunny

    • 67
    • 87

    Slight Chance Thunderstorms

    • 63
    • 85

    Partly Sunny

    • 62
    • 83

    Chance Rain Showers

    • 65
    • 84

    Slight Chance Thunderstorms

Today 27 Aug Yellow Medicine

Sunny. Highs around 80. North Winds 5 to 10 Mph.

Tonight 27 Aug Yellow Medicine

Clear. Lows in the lower 50s. Northeast Winds up to 5 Mph shifting to the south 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 23 August, 2026

    48.7 °F

  • Average August

    71.4 °F

  • Highest 25 August, 2026

    86.5 °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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