Big Trinity Lake Weather Forecast

    • 44
    • 73

    Patchy Smoke

    • 44
    • 71

    Mostly Sunny

    • 48
    • 75

    Mostly Sunny

    • 51
    • 78

    Partly Sunny

    • 47
    • 70

    Slight Chance Rain Showers

    • 45
    • 68

    Chance Rain Showers

Today 20 Aug Boise Mountains

Sunny. Patchy smoke. Highs 79 to 93.

Tonight 20 Aug Boise Mountains

Mostly clear. Lows 43 to 58.

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Big Trinity Lake Temperature Statistics

August Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 8 August, 2025

    51.7 °F

  • Average August

    77.4 °F

  • Highest 12 August, 2025

    102.7 °F

Climate (2020–Present)

Boise Air Terminal (40.4 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    54.4 °F

  • Average High 2020–2025

    65.7 °F
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