Sylvan Lake Weather Forecast

    • 56
    • 81

    Chance Thunderstorms

    • 52
    • 67

    Rain Showers

    • 55
    • 72

    Chance Thunderstorms

    • 56
    • 78

    Slight Chance Thunderstorms

    • 57
    • 81

    Slight Chance Thunderstorms

    • 58
    • 81

    Mostly Sunny

Today 22 Jul Central Black Hills

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs in the mid 80s. West Winds 5 to 10 Mph, becoming north in the afternoon. Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 22 Jul Central Black Hills

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Lows in the upper 50s. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sylvan Lake Temperature Statistics

July Temperature

Custer, Custer County Airport (8.1 miles)

  • Lowest 12 July, 2025

    38.6 °F

  • Average July

    65.1 °F

  • Highest 9 July, 2025

    90.6 °F

Climate (2020–Present)

Custer, Custer County Airport (8.1 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    56.2 °F
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