Tri-Cities Airport Weather Forecast

    • 47
    • 80

    Rain Showers

    • 45
    • 63

    Rain Showers

    • 43
    • 71

    Mostly Sunny

    • 45
    • 73

    Mostly Sunny

    • 46
    • 77

    Sunny

    • 48
    • 80

    Mostly Sunny

Today 12 Sep Lower Columbia Basin of Washington

Mostly cloudy. Highs in the upper 70s to lower 80s. Light Wind, becoming north 5 to 10 Mph in the afternoon.

Tonight 12 Sep Lower Columbia Basin of Washington

A chance of rain Showers in the Evening, then rain Showers overnight. Lows in the upper 40s to lower 50s. Breezy. West wind 10 to 20 Mph with Gusts to around 30 Mph. Chance of precipitation near 100 percent. Rainfall Amounts up to a half of an inch possible.

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Tri-Cities Airport Temperature Statistics

September Temperature

Tri-Cities Airport (0 miles)

  • Lowest 8 September, 2026

    44.7 °F

  • Average September

    65.4 °F

  • Highest 9 September, 2026

    86 °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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