Tri-Cities Airport Weather Forecast

    • 53
    • 84

    Mostly Sunny

    • 54
    • 87

    Mostly Sunny

    • 58
    • 87

    Mostly Sunny

    • 47
    • 79

    Mostly Sunny

    • 47
    • 78

    Sunny

    • 51
    • 83

    Mostly Sunny

    • 53
    • 82

    Partly Sunny

Today 18 Sep Lower Columbia Basin of Washington

Sunny. Highs in the lower to mid 80s. Light Wind, becoming west 5 to 10 Mph in the afternoon.

Tonight 18 Sep Lower Columbia Basin of Washington

Mostly clear. Haze through the night. Patchy smoke overnight. Lows in the mid to upper 50s. Light wind.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 16 September, 2025

    50 °F

  • Average September

    73.1 °F

  • Highest 2 September, 2025

    99 °F

Climate (2020–Present)

Tri-Cities Airport (0 miles)

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  • Average Low 2020–2025

    42.9 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    67.9 °F
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