Rapid Valley Weather Forecast

    • 22
    • 45

    Increasing Clouds

    • 34
    • 50

    Mostly Cloudy

    • 31
    • 61

    Mostly Cloudy

    • 39
    • 56

    Mostly Cloudy

    • 40
    • 66

    Partly Sunny

    • 32
    • 60

    Partly Sunny

Today 20 Dec Rapid City

Mostly sunny. Highs in the lower 40s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 20 Dec Rapid City

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 20s. Southwest Winds 5 to 10 Mph.

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Rapid Valley Temperature Statistics

December Temperature

Rapid City, Rapid City Regional Airport (4.3 miles)

  • Lowest 1 December, 2025

    1.9 °F

  • Average December

    31.6 °F

  • Highest 17 December, 2025

    66 °F

Climate (2020–Present)

Rapid City, Rapid City Regional Airport (4.3 miles)

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  • Average Low 2020–2025

    35.5 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    62.4 °F
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