Big Trinity Lake Weather Forecast

    • 38
    • 65

    Rain Showers Likely

    • 33
    • 52

    Rain Showers Likely

    • 32
    • 47

    Rain Showers Likely

    • 35
    • 54

    Chance Rain Showers

    • 39
    • 60

    Chance Rain Showers

    • 38
    • 59

    Chance Rain Showers

Today 1 Sep Boise Mountains

Partly cloudy. Scattered rain Showers and Thunderstorms this afternoon. Thunderstorms may produce gusty Winds this afternoon. Chance of rain 40 percent. Highs 72 to 86. Breezy.

Tonight 1 Sep Boise Mountains

Increasing Clouds. A chance of rain Showers. A chance of Thunderstorms, mainly in the evening. Patchy fog after midnight. Thunderstorms may produce gusty Winds in the evening. Chance of rain 50 percent. Lows 40 to 55.

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Big Trinity Lake Temperature Statistics

September Temperature

Boise Air Terminal (40.4 miles)

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  • Average September

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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

    66.3 °F
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