Tri-Cities Airport Weather Forecast

    • 50
    • 80

    Mostly Sunny

    • 52
    • 79

    Increasing Clouds

    • 51
    • 81

    Mostly Sunny

    • 51
    • 82

    Mostly Sunny

    • 52
    • 84

    Mostly Sunny

    • 52
    • 84

    Mostly Sunny

    • 49
    • 79

    Mostly Sunny

Today 16 Sep Lower Columbia Basin of Washington

Sunny. Highs in the upper 70s to lower 80s. North wind 5 to 15 Mph.

Tonight 16 Sep Lower Columbia Basin of Washington

Clear. Lows in the lower to mid 50s. North wind 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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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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