Sylvan Lake Weather Forecast

    • 62
    • 82

    Mostly Sunny

    • 59
    • 85

    Slight Chance Thunderstorms

    • 59
    • 82

    Chance Thunderstorms

    • 54
    • 78

    Partly Sunny

    • 49
    • 72

    Mostly Sunny

    • 51
    • 71

    Partly Sunny

    • 53
    • 74

    Partly Sunny

Today 4 Sep Central Black Hills

Sunny. Near steady temperature in the mid 80s. South Winds 5 to 10 Mph with Gusts up to 30 Mph.

Tonight 4 Sep Central Black Hills

Mostly clear. Lows in the lower 60s. Southwest Winds 5 to 10 Mph. Gusts up to 25 Mph this evening.

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  • Temperature Real-Time

Sylvan Lake Temperature Statistics

September Temperature

Custer, Custer County Airport (8.1 miles)

  • Lowest 2 September, 2026

    51.1 °F

  • Average September

    65.6 °F

  • Highest 2 September, 2026

    82 °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

    56.9 °F
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