Fort Pierre National Grassland Weather Forecast

    • 61
    • 83

    Partly Sunny

    • 63
    • 90

    Mostly Sunny

    • 62
    • 88

    Mostly Sunny

    • 63
    • 90

    Mostly Sunny

    • 65
    • 90

    Chance Thunderstorms

    • 62
    • 85

    Chance Rain Showers

Today 5 Aug Lyman

Partly sunny. Warmer with Highs in the lower 80s. Southwest Winds 10 to 15 Mph.

Tonight 5 Aug Lyman

Partly cloudy. Not as cool with Lows around 60. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Fort Pierre National Grassland Temperature Statistics

August Temperature

Pierre, Pierre Regional Airport (15.5 miles)

  • Lowest 1 August, 2026

    55.7 °F

  • Average August

    78.4 °F

  • Highest 2 August, 2026

    100 °F

Climate (2021–2026)

Pierre, Pierre Regional Airport (15.5 miles)

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  • Average Low 2021–2026

    36.9 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    61.4 °F
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