Big Trinity Lake Weather Forecast

    • 20
    • 38

    Rain/Snow

    • 19
    • 33

    Mostly Sunny

    • 24
    • 41

    Mostly Sunny

    • 26
    • 45

    Partly Sunny

    • 29
    • 44

    Partly Sunny

    • 29
    • 45

    Chance Rain/Snow

Today 19 Oct Boise Mountains

Rain Showers. Patchy fog. Chance of rain near 100 percent. Highs 43 to 56.

Tonight 19 Oct Boise Mountains

Decreasing Clouds. A chance of rain and snow Showers in the Evening, then snow Showers likely after midnight. Patchy fog in the evening. Areas of fog after midnight. Chance of precipitation 60 percent. Snow accumulation up to 2 Inches. Lows 23 to 36. Breezy.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

October Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 16 October, 2025

    39 °F

  • Average October

    56.3 °F

  • Highest 10 October, 2025

    84 °F

Climate (2020–Present)

Boise Air Terminal (40.4 miles)

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  • Average Low 2020–2025

    43.8 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    65.7 °F
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