Tri-Cities Airport Weather Forecast

    • 45
    • 74

    Increasing Clouds

    • 46
    • 75

    Chance Rain Showers

    • 48
    • 76

    Chance Rain Showers

    • 48
    • 79

    Chance Rain Showers

    • 49
    • 81

    Partly Sunny

    • 53
    • 86

    Mostly Sunny

    • 53
    • 87

    Partly Sunny

Today 4 Sep Lower Columbia Basin of Washington

Sunny. Highs in the lower to mid 70s. Light wind.

Tonight 4 Sep Lower Columbia Basin of Washington

Mostly clear. Lows in the mid 40s to lower 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 1 September, 2026

    57 °F

  • Average September

    69 °F

  • Highest 1 September, 2026

    84 °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

    68 °F
Get WillyWeather+ to remove ads