Upper Sioux Agency State Park Weather Forecast

    • 43
    • 61

    Rain Showers

    • 36
    • 55

    Partly Sunny

    • 44
    • 64

    Partly Sunny

    • 45
    • 70

    Chance Rain Showers

    • 47
    • 65

    Chance Rain Showers

    • 50
    • 72

    Chance Rain Showers

    • 57
    • 83

    Chance Thunderstorms

Today 18 May Yellow Medicine

Cooler, cloudy. A 50 percent chance of Thunderstorms late in the afternoon. Near steady temperature in the mid 50s. North Winds 10 to 15 Mph.

Tonight 18 May Yellow Medicine

Breezy, cloudy. Chance of Thunderstorms early in the evening. Rain Showers in the Evening, then slight chance of rain Showers after midnight. Lows in the lower 40s. Northwest Winds 15 to 25 Mph. Chance of precipitation 90 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

    57.1 °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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