Tri-Cities Airport Weather Forecast

    • 43
    • 73

    Increasing Clouds

    • 43
    • 73

    Partly Sunny

    • 44
    • 75

    Chance Rain Showers

    • 46
    • 78

    Chance Rain Showers

    • 46
    • 78

    Slight Chance Rain Showers

    • 47
    • 81

    Mostly Sunny

Today 3 Sep Lower Columbia Basin of Washington

Partly cloudy in the Morning, becoming mostly 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

Partly cloudy. A 20 percent chance of rain Showers overnight. Lows in the mid to upper 40s. Southwest wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

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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