Upper Sioux Agency State Park Weather Forecast

    • 68
    • 88

    Slight Chance Thunderstorms

    • 59
    • 82

    Partly Sunny

    • 62
    • 82

    Chance Rain Showers

    • 64
    • 82

    Slight Chance Thunderstorms

Today 30 Aug Yellow Medicine

Mostly sunny. Highs in the upper 80s. Southeast Winds 5 to 10 Mph.

Tonight 30 Aug Yellow Medicine

Mostly cloudy then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows in the upper 60s. South Winds up to 10 Mph shifting to the west 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

    71.1 °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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