Tri-Cities Airport Weather Forecast

    • 54
    • 86

    Increasing Clouds

    • 49
    • 80

    Partly Sunny

    • 49
    • 75

    Partly Sunny

    • 49
    • 74

    Chance Rain Showers

    • 44
    • 69

    Slight Chance Rain Showers

    • 43
    • 66

    Partly Sunny

Today 21 Sep Lower Columbia Basin of Washington

Sunny. Highs in the 80s. Light wind.

Tonight 21 Sep Lower Columbia Basin of Washington

Mostly cloudy. Lows in the lower to mid 50s. Light Wind, becoming southwest 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

    64.8 °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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