Tri-Cities Airport Weather Forecast

    • 50
    • 78

    Increasing Clouds

    • 47
    • 75

    Partly Sunny

    • 48
    • 76

    Partly Sunny

    • 49
    • 78

    Mostly Sunny

    • 49
    • 79

    Mostly Sunny

    • 49
    • 79

    Mostly Sunny

Today 29 Sep Lower Columbia Basin of Washington

Partly cloudy in the morning then clearing. Highs in the mid to upper 70s. Southwest wind 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 29 Sep Lower Columbia Basin of Washington

Partly cloudy. Lows in the lower to mid 50s. Southwest wind 5 to 15 Mph. Gusts up to 30 Mph decreasing to 20 Mph overnight.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 24 September, 2026

    42.7 °F

  • Average September

    64 °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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