Big Trinity Lake Weather Forecast

    • 52
    • 77

    Chance Rain Showers

    • 50
    • 69

    Chance Thunderstorms

    • 51
    • 75

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

    • 50
    • 76

    Mostly Sunny

    • 49
    • 75

    Mostly Sunny

Today 21 Jul Boise Mountains

Mostly cloudy with a slight chance of Showers this Morning, then partly cloudy with a chance of Showers and Thunderstorms this afternoon. Patchy smoke. Chance of rain 30 percent. Highs 84 to 99.

Tonight 21 Jul Boise Mountains

A slight chance of Thunderstorms in the evening. Partly cloudy with a slight chance of Showers. Patchy smoke. Chance of rain 20 percent. Lows 55 to 70.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

July Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 2 July, 2026

    52.6 °F

  • Average July

    81 °F

  • Highest 11 July, 2026

    104.6 °F

Climate (2021–2026)

Boise Air Terminal (40.4 miles)

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  • Average Low 2021–2026

    44.1 °F

  • Average 2021–2026

    54.8 °F

  • Average High 2021–2026

    66.2 °F
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