Big Trinity Lake Weather Forecast

    • 39
    • 68

    Smoke

    • 44
    • 72

    Areas Smoke

    • 48
    • 79

    Patchy Smoke

    • 50
    • 80

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 48
    • 76

    Mostly Sunny

Today 4 Aug Boise Mountains

Sunny. Areas of smoke. Highs 74 to 89.

Tonight 4 Aug Boise Mountains

Mostly clear. Smoke. Lows 42 to 57.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

August Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 1 August, 2026

    73 °F

  • Average August

    87 °F

  • Highest 1 August, 2026

    100 °F

Climate (2021–2026)

Boise Air Terminal (40.4 miles)

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  • Average Low 2021–2026

    44.1 °F

  • Average 2021–2026

    54.9 °F

  • Average High 2021–2026

    66.2 °F
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