Brown Field Weather Forecast

    • 54
    • 69

    Mostly Cloudy

    • 52
    • 83

    Mostly Cloudy

    • 52
    • 79

    Mostly Cloudy

    • 54
    • 76

    Slight Chance Thunderstorms

    • 52
    • 81

    Mostly Sunny

    • 53
    • 75

    Partly Sunny

Today 22 Sep Custer Co Plains

Patchy fog in the morning. Mostly cloudy. Highs in the upper 60s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 22 Sep Custer Co Plains

Mostly cloudy. A chance of Showers in the Evening, then a slight chance of Showers after midnight. Lows in the lower 50s. Southeast Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening. Chance of rain 30 percent.

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Brown Field Temperature Statistics

September Temperature

Rapid City, Rapid City Regional Airport (23 miles)

  • Lowest 15 September, 2026

    41.6 °F

  • Average September

    69 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Rapid City, Rapid City Regional Airport (23 miles)

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  • Average Low 2021–2026

    35.8 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    63.4 °F
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