Tri-Cities Airport Weather Forecast

    • 50
    • 76

    Mostly Cloudy

    • 48
    • 77

    Partly Sunny

    • 49
    • 80

    Mostly Sunny

    • 53
    • 86

    Mostly Sunny

    • 55
    • 89

    Mostly Sunny

    • 49
    • 82

    Partly Sunny

Today 6 Sep Lower Columbia Basin of Washington

Mostly cloudy. A chance of rain Showers. Highs in the lower to mid 70s. Light Wind, becoming northwest 5 to 10 Mph in the afternoon. Chance of precipitation 50 percent.

Tonight 6 Sep Lower Columbia Basin of Washington

Mostly cloudy with a 20 percent chance of rain Showers. Lows in the upper 40s to mid 50s. Southwest wind 5 to 10 Mph.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 4 September, 2026

    46 °F

  • Average September

    66.4 °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

    68 °F
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