Dewey Weather Forecast

    • -7
    • 26

    Chance Snow

    • -10
    • 6

    Snow Likely

    • -3
    • 18

    Partly Sunny

    • -4
    • 18

    Mostly Sunny

    • 13
    • 37

    Partly Sunny

    • 16
    • 40

    Partly Sunny

Today 22 Jan Southern Black Hills

Partly cloudy. A slight chance of snow in the afternoon. Highs in the mid 20s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of snow 20 percent. Wind chill Values near zero.

Tonight 22 Jan Southern Black Hills

Mostly cloudy with a 40 percent chance of snow. Little or no snow accumulation. Colder with Lows around 5 below. East Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Wind chill Values around 15 below after midnight.

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Dewey Temperature Statistics

January Temperature

Custer, Custer County Airport (24.9 miles)

  • Lowest 17 January, 2026

    0 °F

  • Average January

    33.1 °F

  • Highest 1 January, 2026

    55.9 °F

Climate (2021–Present)

Custer, Custer County Airport (24.9 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    45 °F

  • Average High 2021–2026

    56.3 °F
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