Tri-Cities Airport Weather Forecast

    • 45
    • 75

    Increasing Clouds

    • 49
    • 77

    Partly Sunny

    • 45
    • 74

    Mostly Sunny

    • 47
    • 76

    Partly Sunny

    • 46
    • 76

    Mostly Sunny

    • 46
    • 76

    Mostly Sunny

Today 28 Sep Lower Columbia Basin of Washington

Sunny. Highs in the lower to mid 70s. Light Wind, becoming southwest 5 to 10 Mph in the afternoon.

Tonight 28 Sep Lower Columbia Basin of Washington

Mostly clear. Lows in the mid to upper 40s. South wind 5 to 10 Mph.

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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

    64.3 °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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