Tri-Cities Airport Weather Forecast

    • 50
    • 81

    Becoming Sunny

    • 51
    • 82

    Mostly Sunny

    • 52
    • 85

    Mostly Sunny

    • 52
    • 86

    Mostly Sunny

    • 50
    • 81

    Partly Sunny

    • 49
    • 78

    Partly Sunny

Today 18 Sep Lower Columbia Basin of Washington

Mostly cloudy in the morning then clearing. Highs in the upper 70s to lower 80s. Light wind.

Tonight 18 Sep Lower Columbia Basin of Washington

Mostly clear. Lows in the lower to mid 50s. Light wind.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 8 September, 2026

    44.7 °F

  • Average September

    64.7 °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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