Upper Sioux Agency State Park Weather Forecast

    • 35
    • 54

    Gradual Clearing

    • 43
    • 65

    Partly Sunny

    • 45
    • 69

    Mostly Cloudy

    • 45
    • 63

    Chance Rain Showers

    • 48
    • 70

    Mostly Cloudy

    • 54
    • 82

    Slight Chance Thunderstorms

    • 57
    • 87

    Mostly Sunny

Today 19 May Yellow Medicine

Mostly cloudy. Chance of Sprinkles through the day. Near steady temperature in the lower 50s. Northwest Winds 15 to 20 Mph.

Tonight 19 May Yellow Medicine

Mostly cloudy in the evening then clearing. Chance of Sprinkles in the evening. Patchy frost after midnight. Lows in the mid 30s. Northwest Winds up to 10 Mph. Gusts up to 25 Mph in the evening.

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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

    57.5 °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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