Tetrault Lake Weather Forecast

    • 48
    • 79

    Rain Likely

    • 46
    • 69

    Rain Showers Likely

    • 46
    • 79

    Mostly Sunny

    • 46
    • 82

    Mostly Sunny

    • 42
    • 76

    Partly Sunny

    • 42
    • 73

    Chance Rain

Today 14 Sep Kootenai/Cabinet Region

Mostly cloudy. Areas of fog in the morning. A 40 percent chance of rain in the afternoon. Highs in the mid 70s to lower 80s.

Tonight 14 Sep Kootenai/Cabinet Region

Rain likely in the Evening, then a chance of rain after midnight. Chance of rain 70 percent. Lows in the mid 40s to lower 50s.

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Tetrault Lake Temperature Statistics

September Temperature

Boundary County Airport (55.3 miles)

  • Lowest 9 September, 2025

    50 °F

  • Average September

    69.6 °F

  • Highest 2 September, 2025

    95 °F

Climate (2020–Present)

Boundary County Airport (55.3 miles)

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  • Average Low 2020–2025

    37.5 °F

  • Average 2020–2025

    47 °F

  • Average High 2020–2025

    56.4 °F
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