Sylvan Lake Weather Forecast

    • 27
    • 39

    Mostly Sunny

    • 33
    • 52

    Mostly Sunny

    • 41
    • 67

    Mostly Sunny

    • 50
    • 72

    Partly Sunny

    • 40
    • 72

    Chance Rain Showers

    • 21
    • 47

    Rain/Snow Likely

    • 21
    • 41

    Chance Snow Showers

Today 18 Apr Central Black Hills

Partly cloudy with a chance of snow Showers and rain Showers. Near steady temperature in the lower 40s. Northwest Winds 10 to 15 Mph with Gusts up to 40 Mph. Chance of precipitation 30 percent.

Tonight 18 Apr Central Black Hills

Mostly clear. Lows in the upper 20s. West Winds 5 to 10 Mph. Gusts up to 30 Mph this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sylvan Lake Temperature Statistics

April Temperature

Custer, Custer County Airport (8.1 miles)

  • Lowest 7 April, 2026

    20.6 °F

  • Average April

    41.2 °F

  • Highest 11 April, 2026

    72.6 °F

Climate (2021–Present)

Custer, Custer County Airport (8.1 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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