Upper Sioux Agency State Park Weather Forecast

    • 65
    • 78

    Chance Rain Showers

    • 62
    • 82

    Slight Chance Thunderstorms

    • 56
    • 78

    Mostly Sunny

    • 60
    • 80

    Chance Rain Showers

    • 59
    • 80

    Chance Thunderstorms

    • 57
    • 76

    Slight Chance Thunderstorms

Today 14 Aug Yellow Medicine

Partly sunny. Slight chance of Showers early in the afternoon. Chance of Showers late in the afternoon. Highs in the upper 70s. East Winds 5 to 15 Mph. Chance of Showers 40 percent.

Tonight 14 Aug Yellow Medicine

Mostly cloudy. Chance of Showers in the Evening, then slight chance of Showers after midnight. Lows in the mid 60s. Southeast Winds 5 to 15 Mph. Chance of Showers 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

    71.5 °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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