Tri-Cities Airport Weather Forecast

    • 45
    • 73

    Decreasing Clouds

    • 45
    • 73

    Partly Sunny

    • 46
    • 74

    Chance Rain Showers

    • 48
    • 77

    Chance Rain Showers

    • 47
    • 77

    Slight Chance Rain Showers

    • 47
    • 80

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

Today 3 Sep Lower Columbia Basin of Washington

Partly cloudy. Highs in the upper 60s to lower 70s. Southwest wind 5 to 10 Mph with Gusts to around 20 Mph.

Tonight 3 Sep Lower Columbia Basin of Washington

Mostly cloudy. A 20 percent chance of rain Showers overnight. Lows in the mid 40s to lower 50s. South wind 5 to 10 Mph in the Evening, becoming light.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 1 September, 2026

    57 °F

  • Average September

    70.6 °F

  • Highest 1 September, 2026

    84 °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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