Tri-Cities Airport Weather Forecast

    • 47
    • 72

    Gradual Clearing

    • 49
    • 81

    Mostly Sunny

    • 50
    • 80

    Partly Sunny

    • 50
    • 82

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

Today 15 Sep Lower Columbia Basin of Washington

Partly cloudy. Highs in the mid to upper 70s.

Tonight 15 Sep Lower Columbia Basin of Washington

Mostly cloudy. Lows in the upper 40s to lower 50s. North wind 5 to 10 Mph.

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  • Temperature Real-Time

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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