Big Trinity Lake Weather Forecast

    • 13
    • 36

    Mostly Sunny

    • 14
    • 34

    Mostly Sunny

    • 15
    • 34

    Mostly Sunny

    • 17
    • 31

    Mostly Cloudy

    • 19
    • 33

    Partly Sunny

    • 17
    • 27

    Chance Snow

Today 18 Jan Boise Mountains

Patchy fog this morning. Sunny. Highs 32 to 42.

Tonight 18 Jan Boise Mountains

Mostly clear. Patchy fog. Lows 13 to 25.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

January Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 15 January, 2026

    25 °F

  • Average January

    36.7 °F

  • Highest 3 January, 2026

    57.9 °F

Climate (2021–Present)

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 °F
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