Sylvan Lake Weather Forecast

    • 47
    • 62

    Mostly Sunny

    • 52
    • 69

    Decreasing Clouds

    • 38
    • 69

    Chance Rain

    • 30
    • 48

    Partly Sunny

    • 28
    • 40

    Chance Rain/Snow

    • 29
    • 41

    Mostly Cloudy

    • 33
    • 52

    Partly Sunny

Today 21 Oct Central Black Hills

Partly cloudy in the Morning, then becoming mostly sunny. Highs in the mid 50s.

Tonight 21 Oct Central Black Hills

Mostly clear. Lows in the upper 40s. South Winds 5 to 10 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sylvan Lake Temperature Statistics

October Temperature

Custer, Custer County Airport (8.1 miles)

  • Lowest 16 October, 2026

    26.7 °F

  • Average October

    52.7 °F

  • Highest 5 October, 2026

    81.6 °F

Climate (2021–2026)

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

    57 °F
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