Round Lake Weather Forecast

    • 37
    • 58

    Increasing Clouds

    • 32
    • 47

    Chance Rain/Snow

    • 37
    • 54

    Mostly Sunny

    • 44
    • 61

    Partly Sunny

    • 45
    • 61

    Partly Sunny

    • 43
    • 58

    Slight Chance Thunderstorms

Today 6 Sep Big Lost Highlands/Copper Basin

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs 65 to 75.

Tonight 6 Sep Big Lost Highlands/Copper Basin

Mostly cloudy with a chance of rain Showers and a slight chance of Thunderstorms. Colder. Lows 35 to 45.

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Round Lake Temperature Statistics

September Temperature

Hailey, Friedman Memorial Airport (28 miles)

  • Lowest 3 September, 2026

    42.8 °F

  • Average September

    55.6 °F

  • Highest 1 September, 2026

    77 °F

Climate (2021–2026)

Hailey, Friedman Memorial Airport (28 miles)

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  • Average Low 2021–2026

    34.8 °F

  • Average 2021–2026

    43.3 °F

  • Average High 2021–2026

    56.7 °F
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