Tri-Cities Airport Weather Forecast

    • 46
    • 71

    Becoming Sunny

    • 48
    • 78

    Mostly Sunny

    • 48
    • 80

    Mostly Sunny

    • 49
    • 82

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 50
    • 84

    Mostly Sunny

Today 15 Sep Lower Columbia Basin of Washington

Mostly cloudy. Highs in the upper 60s to lower 70s. Light wind.

Tonight 15 Sep Lower Columbia Basin of Washington

Mostly cloudy in the evening then clearing. Lows in the mid 40s to lower 50s. North wind 5 to 10 Mph.

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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

    65.1 °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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