Tri-Cities Airport Weather Forecast

    • 45
    • 74

    Increasing Clouds

    • 45
    • 73

    Chance Rain Showers

    • 47
    • 77

    Chance Rain Showers

    • 47
    • 77

    Slight Chance Rain Showers

    • 48
    • 81

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

Today 4 Sep Lower Columbia Basin of Washington

Mostly cloudy in the morning then clearing. Highs in the lower to mid 70s. Light wind.

Tonight 4 Sep Lower Columbia Basin of Washington

Mostly clear. Lows in the mid to upper 40s. Light wind.

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  • Temperature Real-Time

Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 1 September, 2026

    57 °F

  • Average September

    69 °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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