Dewey Weather Forecast

    • 22
    • 42

    Increasing Clouds

    • 25
    • 45

    Partly Sunny

    • 26
    • 54

    Chance Rain/Snow

    • 25
    • 39

    Rain/Snow Likely

    • 11
    • 33

    Chance Snow

    • 8
    • 22

    Slight Chance Snow

    • 14
    • 33

    Mostly Cloudy

Today 7 Dec Southern Black Hills

Mostly sunny. Highs in the upper 30s. West Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 7 Dec Southern Black Hills

Partly cloudy. Lows in the mid 20s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Dewey Temperature Statistics

December Temperature

Custer, Custer County Airport (24.9 miles)

  • Lowest 1 December, 2025

    7 °F

  • Average December

    24.7 °F

  • Highest 2 December, 2025

    34 °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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