Keystone Weather Forecast

    • 41
    • 59

    Partly Sunny

    • 41
    • 62

    Mostly Cloudy

    • 29
    • 58

    Chance Snow

    • 27
    • 42

    Chance Snow

    • 27
    • 44

    Chance Snow

    • 25
    • 46

    Mostly Sunny

Today 7 Feb Central Black Hills

Becoming mostly cloudy. Highs in the mid 50s. Northwest Winds 10 to 15 Mph with Gusts up to 35 Mph.

Tonight 7 Feb Central Black Hills

Mostly cloudy in the Evening, then clearing. Lows in the mid 30s. Northwest Winds 5 to 10 Mph with Gusts up to 30 Mph.

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Keystone Temperature Statistics

February Temperature

Custer, Custer County Airport (14.9 miles)

  • Lowest 4 February, 2026

    21.9 °F

  • Average February

    38.4 °F

  • Highest 5 February, 2026

    60.1 °F

Climate (2021–Present)

Custer, Custer County Airport (14.9 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    45 °F

  • Average High 2021–2026

    56.4 °F
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