Big Trinity Lake Weather Forecast

    • 26
    • 36

    Increasing Clouds

    • 23
    • 38

    Partly Sunny

    • 23
    • 41

    Mostly Sunny

    • 24
    • 38

    Partly Sunny

    • 28
    • 38

    Snow

    • 25
    • 34

    Snow Likely

Today 11 Dec Boise Mountains

Mostly sunny. Areas of fog in the morning. Patchy fog in the afternoon. Highs 41 to 55.

Tonight 11 Dec Boise Mountains

Partly cloudy. Areas of fog. Lows 28 to 40.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

December Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 1 December, 2025

    21 °F

  • Average December

    37.8 °F

  • Highest 8 December, 2025

    53.1 °F

Climate (2020–Present)

Boise Air Terminal (40.4 miles)

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  • Average Low 2020–2025

    44 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    65.9 °F
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