Sylvan Lake Weather Forecast

    • 54
    • 75

    Increasing Clouds

    • 54
    • 72

    Rain Showers Likely

    • 54
    • 71

    Rain Showers

    • 63
    • 83

    Mostly Sunny

    • 65
    • 88

    Partly Sunny

    • 63
    • 86

    Slight Chance Thunderstorms

Today 21 Jul Central Black Hills

Partly cloudy. Isolated Sprinkles this morning. Highs around 80. East Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon.

Tonight 21 Jul Central Black Hills

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly cloudy with Showers likely with a slight chance of Thunderstorms after midnight. Lows in the upper 50s. East Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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  • Temperature Real-Time

Sylvan Lake Temperature Statistics

July Temperature

Custer, Custer County Airport (8.1 miles)

  • Lowest 3 July, 2026

    50.6 °F

  • Average July

    70.7 °F

  • Highest 12 July, 2026

    91.7 °F

Climate (2021–2026)

Custer, Custer County Airport (8.1 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    45.3 °F

  • Average High 2021–2026

    56.9 °F
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