Tri-Cities Airport Weather Forecast

    • 46
    • 75

    Increasing Clouds

    • 47
    • 77

    Partly Sunny

    • 48
    • 79

    Mostly Sunny

    • 48
    • 81

    Mostly Sunny

    • 50
    • 80

    Mostly Sunny

    • 48
    • 83

    Mostly Sunny

Today 30 Sep Lower Columbia Basin of Washington

Partly cloudy. Highs in the lower to mid 70s. West wind 5 to 10 Mph.

Tonight 30 Sep Lower Columbia Basin of Washington

Partly cloudy. Lows in the upper 40s to lower 50s. Light wind.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 28 September, 2026

    35.1 °F

  • Average September

    63.9 °F

  • Highest 10 September, 2026

    90.6 °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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