Upper Sioux Agency State Park Weather Forecast

    • 61
    • 93

    Mostly Sunny

    • 61
    • 91

    Increasing Clouds

    • 60
    • 91

    Partly Sunny

    • 60
    • 90

    Partly Sunny

    • 59
    • 87

    Slight Chance Thunderstorms

    • 57
    • 86

    Slight Chance Thunderstorms

    • 56
    • 85

    Slight Chance Thunderstorms

Today 27 May Yellow Medicine

Sunny. Highs in the lower 90s. East Winds 5 to 10 Mph.

Tonight 27 May Yellow Medicine

Clear. Lows in the lower 60s. East Winds 5 to 15 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

    57.9 °F

  • Highest 25 May, 2026

    93.9 °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

    48.1 °F

  • Average High 2021–2026

    58.7 °F
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