Big Trinity Lake Weather Forecast

    • 20
    • 26

    Partly Sunny

    • 28
    • 41

    Partly Sunny

    • 32
    • 50

    Partly Sunny

    • 35
    • 55

    Mostly Sunny

    • 37
    • 56

    Mostly Sunny

    • 38
    • 58

    Mostly Sunny

Today 15 Mar Boise Mountains

Mostly sunny. Highs 33 to 47.

Tonight 15 Mar Boise Mountains

Mostly cloudy with a 20 percent chance of snow. Not as cold with Lows 19 to 34.

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Big Trinity Lake Temperature Statistics

March Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 11 March, 2026

    30 °F

  • Average March

    46.5 °F

  • Highest 8 March, 2026

    64.9 °F

Climate (2021–Present)

Boise Air Terminal (40.4 miles)

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  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    54.9 °F

  • Average High 2021–2026

    66.1 °F
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