Big Lost Lake Weather Forecast

    • 47
    • 59

    Increasing Clouds

    • 46
    • 59

    Mostly Cloudy

    • 44
    • 58

    Partly Sunny

    • 38
    • 52

    Slight Chance Thunderstorms

    • 42
    • 56

    Sunny

    • 45
    • 60

    Mostly Sunny

Today 18 Sep Sun Valley Region

Sunny. Highs 67 to 77.

Tonight 18 Sep Sun Valley Region

Mostly cloudy. Lows 43 to 53.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Lost Lake Temperature Statistics

September Temperature

Hailey, Friedman Memorial Airport (24.2 miles)

  • Lowest 13 September, 2025

    42.8 °F

  • Average September

    59.3 °F

  • Highest 3 September, 2025

    89.6 °F

Climate (2020–Present)

Hailey, Friedman Memorial Airport (24.2 miles)

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  • Average Low 2020–2025

    33.9 °F

  • Average 2020–2025

    42.2 °F

  • Average High 2020–2025

    55.9 °F
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