Upper Sioux Agency State Park Weather Forecast

    • 58
    • 86

    Severe Tstms

    • 61
    • 91

    Slight Chance Thunderstorms

    • 61
    • 93

    Partly Sunny

    • 60
    • 91

    Partly Sunny

    • 61
    • 86

    Mostly Cloudy

    • 59
    • 83

    Chance Thunderstorms

    • 56
    • 81

    Slight Chance Thunderstorms

Today 24 May Yellow Medicine

Warmer, sunny. Near steady temperature in the lower 80s. South Winds 5 to 15 Mph.

Tonight 24 May Yellow Medicine

Mostly cloudy with chance of Thunderstorms in the Evening, then mostly cloudy with slight chance of Thunderstorms after midnight. Partly cloudy late in the night. Some Thunderstorms may be severe with damaging Winds and large hail in the evening. Lows in the upper 50s. South Winds 5 to 15 Mph. Chance of Thunderstorms 50 percent.

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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

    56.4 °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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