Big Rock Park Weather Forecast

    • 43
    • 80

    Slight Chance Thunderstorms

    • 46
    • 64

    Partly Sunny

    • 50
    • 64

    Chance Thunderstorms

    • 39
    • 68

    Mostly Sunny

    • 43
    • 61

    Slight Chance Rain Showers

    • 44
    • 74

    Slight Chance Thunderstorms

Today 11 Sep Central Black Hills

Mostly sunny. Highs around 80. Northwest Winds 10 to 15 Mph with Gusts up to 35 Mph.

Tonight 11 Sep Central Black Hills

Partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Lows in the mid 40s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Rock Park Temperature Statistics

September Temperature

Custer, Custer County Airport (1.9 miles)

  • Lowest 9 September, 2026

    44.1 °F

  • Average September

    67.1 °F

  • Highest 4 September, 2026

    86.6 °F

Climate (2021–2026)

Custer, Custer County Airport (1.9 miles)

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  • Average Low 2021–2026

    33.6 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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