Tri-Cities Airport Weather Forecast

    • 55
    • 86

    Increasing Clouds

    • 51
    • 87

    Mostly Cloudy

    • 49
    • 76

    Mostly Cloudy

    • 47
    • 73

    Rain Showers Likely

    • 45
    • 73

    Mostly Sunny

    • 46
    • 76

    Mostly Sunny

Today 9 Sep Lower Columbia Basin of Washington

Sunny. Highs in the 80s. Light wind.

Tonight 9 Sep Lower Columbia Basin of Washington

Partly cloudy. Lows in the mid to upper 50s. South wind 5 to 10 Mph in the Evening, becoming light.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 4 September, 2026

    46.7 °F

  • Average September

    65.6 °F

  • Highest 1 September, 2026

    85.6 °F

Climate (2021–2026)

Tri-Cities Airport (0 miles)

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  • Average Low 2021–2026

    42.8 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    67.9 °F
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