Upper Sioux Agency State Park Weather Forecast

    • 46
    • 68

    Slight Chance Rain Showers

    • 47
    • 60

    Rain Showers

    • 48
    • 70

    Partly Sunny

    • 55
    • 81

    Chance Thunderstorms

    • 59
    • 88

    Mostly Sunny

    • 60
    • 88

    Mostly Sunny

    • 60
    • 86

    Slight Chance Thunderstorms

Today 21 May Yellow Medicine

Partly sunny. Near steady temperature in the upper 60s. Southeast Winds 15 to 20 Mph.

Tonight 21 May Yellow Medicine

Increasing Clouds. A 20 percent chance of rain Showers late in the night. Lows in the mid 40s. Southeast Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

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

    56.8 °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

    48.1 °F

  • Average High 2021–2026

    58.7 °F
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