Tri-Cities Airport Weather Forecast

    • 50
    • 80

    Mostly Sunny

    • 54
    • 86

    Mostly Sunny

    • 49
    • 87

    Mostly Sunny

    • 48
    • 76

    Partly Sunny

    • 46
    • 74

    Chance Rain Showers

    • 46
    • 75

    Mostly Sunny

Today 8 Sep Lower Columbia Basin of Washington

Sunny. Highs in the upper 70s to lower 80s. Light wind.

Tonight 8 Sep Lower Columbia Basin of Washington

Mostly clear. Lows in the lower to mid 50s. Light wind.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 4 September, 2026

    46.7 °F

  • Average September

    65.2 °F

  • Highest 1 September, 2026

    85.6 °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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