Sylvan Lake Weather Forecast

    • 32
    • 53

    Increasing Clouds

    • 41
    • 52

    Mostly Cloudy

    • 42
    • 55

    Breezy

    • 37
    • 54

    Partly Sunny

    • 27
    • 48

    Partly Sunny

    • 16
    • 35

    Partly Sunny

    • 23
    • 35

    Partly Sunny

Today 22 Dec Central Black Hills

Sunny. Highs in the 50s to lower 60s. West Winds 10 to 15 Mph with Gusts up to 50 Mph.

Tonight 22 Dec Central Black Hills

Partly cloudy. Lows in the lower 30s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph this evening.

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Sylvan Lake Temperature Statistics

December Temperature

Custer, Custer County Airport (8.1 miles)

  • Lowest 1 December, 2025

    7 °F

  • Average December

    31.1 °F

  • Highest 14 December, 2025

    57 °F

Climate (2020–Present)

Custer, Custer County Airport (8.1 miles)

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  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    44.9 °F

  • Average High 2020–2025

    56.2 °F
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