Tri-Cities Airport Weather Forecast

    • 45
    • 63

    Rain Showers Likely

    • 44
    • 73

    Mostly Sunny

    • 45
    • 72

    Partly Sunny

    • 46
    • 77

    Sunny

    • 48
    • 80

    Sunny

    • 49
    • 82

    Mostly Sunny

Today 13 Sep Lower Columbia Basin of Washington

A chance of rain Showers in the Morning, then rain Showers likely in the afternoon. Highs in the upper 50s to lower 60s. Breezy. Southwest wind 10 to 20 Mph with Gusts to around 30 Mph. Chance of precipitation 70 percent. Rainfall Amounts less than a quarter of an inch.

Tonight 13 Sep Lower Columbia Basin of Washington

Cloudy with a 50 percent chance of rain Showers in the Evening, then mostly clear overnight. Lows in the mid to upper 40s. Southwest wind 5 to 15 Mph with Gusts to around 25 Mph. Rainfall Amounts less than a tenth of an inch.

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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

    66.1 °F

  • Highest 10 September, 2026

    89.1 °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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