Upper Sioux Agency State Park Weather Forecast

    • 72
    • 88

    Thunderstorms Likely

    • 66
    • 94

    Slight Chance Thunderstorms

    • 57
    • 81

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 63
    • 82

    Chance Rain Showers

    • 64
    • 82

    Mostly Sunny

Today 19 Jul Yellow Medicine

Mostly sunny. Highs around 90. South Winds 5 to 15 Mph.

Tonight 19 Jul Yellow Medicine

Warmer. Mostly clear in the Evening, then mostly cloudy with a 20 percent chance of Thunderstorms after midnight. Lows in the mid 70s. South Winds 10 to 15 Mph with Gusts to around 30 Mph.

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Upper Sioux Agency State Park Temperature Statistics

July Temperature

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

  • Lowest 2 July, 2026

    62.8 °F

  • Average July

    75 °F

  • Highest 17 July, 2026

    94.3 °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

    58.5 °F
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