Dewey Weather Forecast

    • 31
    • 64

    Mostly Sunny

    • 32
    • 63

    Mostly Sunny

    • 37
    • 65

    Mostly Sunny

    • 43
    • 71

    Partly Sunny

    • 36
    • 66

    Chance Rain Showers

    • 30
    • 54

    Chance Rain Showers

    • 26
    • 50

    Mostly Sunny

Today 22 Oct Southern Black Hills

Sunny. Highs in the lower 60s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 22 Oct Southern Black Hills

Mostly clear. Lows in the mid 30s. Northeast Winds 5 to 10 Mph.

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Dewey Temperature Statistics

October Temperature

Custer, Custer County Airport (24.9 miles)

  • Lowest 13 October, 2025

    26.1 °F
  • Average October

    48.9 °F
  • Highest 3 October, 2025

    81 °F

Climate (2020–Present)

Custer, Custer County Airport (24.9 miles)

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  • Average Low 2020–2025

    33.2 °F
  • Average 2020–2025

    44.8 °F
  • Average High 2020–2025

    56.2 °F
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