Upper Sioux Agency State Park Weather Forecast

    • 65
    • 87

    Rain Showers

    • 58
    • 76

    Rain Showers

    • 58
    • 80

    Mostly Sunny

    • 63
    • 82

    Mostly Sunny

    • 62
    • 83

    Chance Rain Showers

    • 55
    • 75

    Chance Rain Showers

    • 58
    • 76

    Partly Sunny

Today 30 Jul Yellow Medicine

Mostly cloudy. A 20 percent chance of Thunderstorms late in the afternoon. Near steady temperature in the mid 80s. South Winds 10 to 15 Mph.

Tonight 30 Jul Yellow Medicine

Chance of Thunderstorms early in the Evening, then Showers and chance of Thunderstorms in the late evening and overnight. Locally heavy rainfall possible in the late evening and overnight. Lows in the mid 60s. South Winds 5 to 10 Mph shifting to the east after midnight. Chance of precipitation near 100 percent.

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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 23 July, 2026

    50.9 °F

  • Average July

    75.6 °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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