Tri-Cities Airport Weather Forecast

    • 45
    • 74

    Increasing Clouds

    • 46
    • 70

    Mostly Cloudy

    • 48
    • 79

    Sunny

    • 49
    • 82

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 50
    • 84

    Mostly Sunny

Today 14 Sep Lower Columbia Basin of Washington

Sunny. Highs in the upper 60s to lower 70s. Southwest wind 5 to 10 Mph with Gusts to around 20 Mph.

Tonight 14 Sep Lower Columbia Basin of Washington

Mostly clear. Lows in the mid to upper 40s. Southwest wind 5 to 15 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

    66.1 °F

  • Highest 10 September, 2026

    89.1 °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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