Upper Sioux Agency State Park Weather Forecast

    • 42
    • 65

    Mostly Cloudy

    • 45
    • 69

    Chance Rain Showers

    • 46
    • 63

    Rain Showers

    • 46
    • 68

    Mostly Cloudy

    • 53
    • 80

    Mostly Sunny

    • 58
    • 87

    Mostly Sunny

    • 59
    • 89

    Partly Sunny

Today 20 May Yellow Medicine

Not as cool. Sunny. Highs in the mid 60s. Southeast Winds 5 to 10 Mph.

Tonight 20 May Yellow Medicine

Mostly cloudy. Lows in the lower 40s. Southeast Winds 5 to 10 Mph.

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Upper Sioux Agency State Park Temperature Statistics

May Temperature

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

  • Lowest 5 May, 2026

    29.1 °F

  • Average May

    57.3 °F

  • Highest 15 May, 2026

    89.8 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    37.5 °F

  • Average 2021–2026

    48.2 °F

  • Average High 2021–2026

    58.7 °F
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