Tri-Cities Airport Weather Forecast

    • 47
    • 77

    Increasing Clouds

    • 51
    • 78

    Rain Showers

    • 43
    • 71

    Rain Showers

    • 42
    • 67

    Partly Sunny

    • 42
    • 68

    Partly Sunny

    • 43
    • 69

    Partly Sunny

Today 23 Sep Lower Columbia Basin of Washington

Partly cloudy. Highs in the mid to upper 70s. South wind 5 to 10 Mph.

Tonight 23 Sep Lower Columbia Basin of Washington

Partly cloudy. Lows in the upper 40s to lower 50s. Light wind.

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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

    68 °F
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