Big Trinity Lake Weather Forecast

    • 13
    • 29

    Mostly Sunny

    • 23
    • 39

    Partly Sunny

    • 32
    • 48

    Mostly Cloudy

    • 34
    • 55

    Partly Sunny

    • 32
    • 53

    Chance Rain/Snow

    • 28
    • 40

    Snow Showers Likely

Today 17 Apr Boise Mountains

Patchy fog in the morning. Sunny. Highs 36 to 50.

Tonight 17 Apr Boise Mountains

Mostly clear. Lows 11 to 26.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

April Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 3 April, 2026

    30.7 °F

  • Average April

    52.9 °F

  • Highest 6 April, 2026

    74.6 °F

Climate (2021–Present)

Boise Air Terminal (40.4 miles)

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  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    55 °F

  • Average High 2021–2026

    66.2 °F
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