Dewey Weather Forecast

    • 62
    • 92

    Slight Chance Thunderstorms

    • 64
    • 91

    Mostly Sunny

    • 65
    • 98

    Hot

    • 57
    • 87

    Chance Thunderstorms

    • 57
    • 82

    Slight Chance Thunderstorms

    • 58
    • 85

    Partly Sunny

Today 5 Aug Southern Black Hills

Sunny with a slight chance of Showers and Thunderstorms. Highs in the upper 80s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 5 Aug Southern Black Hills

Clear. A slight chance of Showers and Thunderstorms in the evening. Lows in the lower 60s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Dewey Temperature Statistics

August Temperature

Custer, Custer County Airport (24.9 miles)

  • Lowest 2 August, 2025

    51.1 °F

  • Average August

    65.2 °F

  • Highest 2 August, 2025

    78.1 °F

Climate (2020–Present)

Custer, Custer County Airport (24.9 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    56.2 °F
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