Dewey Weather Forecast

    • 31
    • 54

    Mostly Sunny

    • 38
    • 67

    Chance Rain Showers

    • 44
    • 71

    Partly Sunny

    • 38
    • 68

    Rain Showers Likely

    • 42
    • 75

    Mostly Sunny

    • 45
    • 84

    Partly Sunny

Today 6 May Southern Black Hills

Mostly sunny. Highs around 50. West Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 6 May Southern Black Hills

Mostly clear. Lows in the mid 30s. Northwest Winds 5 to 10 Mph. Gusts up to 30 Mph in the evening.

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Dewey Temperature Statistics

May Temperature

Custer, Custer County Airport (24.9 miles)

  • Lowest 2 May, 2026

    27.6 °F

  • Average May

    46 °F

  • Highest 2 May, 2026

    69.7 °F

Climate (2021–Present)

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

    56.9 °F
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