Dewey Weather Forecast

    • 54
    • 67

    Mostly Cloudy

    • 50
    • 79

    Partly Sunny

    • 52
    • 77

    Partly Sunny

    • 53
    • 76

    Mostly Sunny

    • 52
    • 81

    Mostly Sunny

    • 52
    • 76

    Partly Sunny

Today 22 Sep Southern Black Hills

Areas of fog in the morning. Mostly cloudy. Highs in the mid 60s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 22 Sep Southern Black Hills

Partly cloudy in the Evening, then becoming mostly cloudy. A 50 percent chance of Showers. Lows in the mid 50s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Dewey Temperature Statistics

September Temperature

Custer, Custer County Airport (24.9 miles)

  • Lowest 15 September, 2026

    39.7 °F

  • Average September

    62.5 °F

  • Highest 4 September, 2026

    86.6 °F

Climate (2021–2026)

Custer, Custer County Airport (24.9 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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