Big Lost Lake Weather Forecast

    • 36
    • 46

    Rain Showers

    • 37
    • 52

    Partly Sunny

    • 41
    • 55

    Mostly Sunny

    • 40
    • 56

    Partly Sunny

    • 41
    • 56

    Mostly Sunny

    • 42
    • 56

    Partly Sunny

Today 19 Sep Sun Valley Region

Partly sunny. A chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Highs 54 to 64.

Tonight 19 Sep Sun Valley Region

Mostly cloudy in the evening then clearing. Lows 32 to 42.

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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 14 September, 2026

    33.8 °F

  • Average September

    54.9 °F

  • Highest 9 September, 2026

    78.8 °F

Climate (2021–2026)

Hailey, Friedman Memorial Airport (24.2 miles)

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  • Average Low 2021–2026

    34.8 °F

  • Average 2021–2026

    43.3 °F

  • Average High 2021–2026

    56.6 °F
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