Big Trinity Lake Weather Forecast

    • 37
    • 59

    Sunny

    • 42
    • 65

    Sunny

    • 48
    • 71

    Sunny

    • 49
    • 77

    Mostly Sunny

    • 46
    • 74

    Mostly Sunny

    • 44
    • 68

    Sunny

    • 47
    • 70

    Sunny

Today 5 Jul Boise Mountains

Sunny. Highs 67 to 81.

Tonight 5 Jul Boise Mountains

Clear. Lows 39 to 54.

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Big Trinity Lake Temperature Statistics

July Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 3 July, 2025

    66 °F

  • Average July

    82.4 °F

  • Highest 1 July, 2025

    102 °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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