Upper Sioux Agency State Park Weather Forecast

    • 34
    • 54

    Mostly Cloudy

    • 32
    • 54

    Mostly Sunny

    • 46
    • 66

    Partly Sunny

    • 44
    • 66

    Partly Sunny

    • 40
    • 66

    Breezy

    • 38
    • 61

    Slight Chance Rain Showers

Today 30 Apr Yellow Medicine

Mostly sunny. Chance of Sprinkles early in the afternoon. Slight chance of Thunderstorms late in the afternoon. Highs in the lower 50s. Northwest Winds 10 to 15 Mph. Chance of precipitation 20 percent.

Tonight 30 Apr Yellow Medicine

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Evening, then chance of Sprinkles after midnight. Areas of frost after midnight. Lows in the lower 30s. Northwest Winds 5 to 10 Mph. Chance of precipitation 30 percent.

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Upper Sioux Agency State Park Temperature Statistics

April Temperature

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

  • Lowest 7 April, 2026

    15.8 °F

  • Average April

    43.7 °F

  • Highest 16 April, 2026

    88.3 °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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