Tri-Cities Airport Weather Forecast

    • 40
    • 68

    Increasing Clouds

    • 40
    • 72

    Partly Sunny

    • 45
    • 74

    Mostly Sunny

    • 46
    • 76

    Partly Sunny

    • 44
    • 72

    Partly Sunny

    • 43
    • 71

    Partly Sunny

Today 26 Sep Lower Columbia Basin of Washington

Partly cloudy in the morning then clearing. Highs in the mid to upper 60s. Southwest wind 5 to 10 Mph in the Morning, becoming light.

Tonight 26 Sep Lower Columbia Basin of Washington

Mostly cloudy. Lows in the lower to mid 40s. Light Wind, becoming north 5 to 10 Mph overnight.

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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

    65.1 °F

  • Highest 10 September, 2026

    90.6 °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

    67.9 °F
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