Fort Pierre National Grassland Weather Forecast

    • 63
    • 84

    Increasing Clouds

    • 59
    • 79

    Rain Showers Likely

    • 57
    • 76

    Rain Showers Likely

    • 56
    • 78

    Slight Chance Thunderstorms

    • 57
    • 81

    Mostly Sunny

    • 55
    • 85

    Partly Sunny

Today 28 Aug Lyman

Partly sunny. Highs in the mid 80s. Northeast Winds 5 to 10 Mph, becoming east in the afternoon.

Tonight 28 Aug Lyman

Mostly clear. Lows around 60. Northeast Winds 5 to 10 Mph.

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Fort Pierre National Grassland Temperature Statistics

August Temperature

Pierre, Pierre Regional Airport (15.5 miles)

  • Lowest 24 August, 2025

    48 °F

  • Average August

    76.1 °F

  • Highest 13 August, 2025

    104.6 °F

Climate (2020–Present)

Pierre, Pierre Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    36.7 °F

  • Average 2020–2025

    48.6 °F

  • Average High 2020–2025

    61.2 °F
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