Upper Sioux Agency State Park Weather Forecast

    • 66
    • 84

    Rain Showers

    • 66
    • 85

    Partly Sunny

    • 68
    • 89

    Slight Chance Thunderstorms

    • 63
    • 86

    Partly Sunny

    • 63
    • 84

    Chance Rain Showers

    • 66
    • 86

    Slight Chance Thunderstorms

Today 28 Aug Yellow Medicine

Mostly cloudy. Highs in the mid 80s. South Winds 10 to 15 Mph.

Tonight 28 Aug Yellow Medicine

Warmer. Mostly cloudy. Chance of Showers and slight chance of Thunderstorms early in the Evening, then Showers and chance of Thunderstorms after midnight. Lows in the upper 60s. South Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 80 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 23 August, 2026

    48.7 °F

  • Average August

    71.3 °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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