Fort Pierre National Grassland Weather Forecast

    • 14
    • 33

    Chance Freezing Rain

    • 4
    • 19

    Snow

    • -6
    • 8

    Snow Likely

    • 21
    • 30

    Partly Sunny

    • 25
    • 39

    Partly Sunny

    • 28
    • 46

    Mostly Cloudy

Today 11 Dec Lyman

Mostly cloudy with a slight chance of rain and freezing rain. Near steady temperature around 30. North Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of precipitation 20 percent.

Tonight 11 Dec Lyman

Cloudy. A slight chance of freezing rain in the evening. Brisk with Lows around 15. North Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming northwest 15 to 25 Mph with Gusts up to 35 Mph after midnight. Chance of precipitation 20 percent.

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Fort Pierre National Grassland Temperature Statistics

December Temperature

Pierre, Pierre Regional Airport (15.5 miles)

  • Lowest 1 December, 2025

    7 °F

  • Average December

    24.9 °F

  • Highest 9 December, 2025

    53.1 °F

Climate (2020–Present)

Pierre, Pierre Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    37 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    61.2 °F
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