Tri-Cities Airport Weather Forecast

    • 50
    • 77

    Increasing Clouds

    • 49
    • 80

    Rain Showers

    • 46
    • 66

    Rain Showers

    • 45
    • 72

    Mostly Sunny

    • 47
    • 75

    Mostly Sunny

    • 48
    • 78

    Mostly Sunny

Today 11 Sep Lower Columbia Basin of Washington

Mostly cloudy. Highs in the 70s. Southwest wind 5 to 10 Mph.

Tonight 11 Sep Lower Columbia Basin of Washington

Mostly cloudy. Lows in the lower to mid 50s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

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)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    42.8 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    67.9 °F
Get WillyWeather+ to remove ads