Tri-Cities Airport Weather Forecast

    • 48
    • 75

    Mostly Cloudy

    • 50
    • 73

    Chance Rain Showers

    • 47
    • 77

    Slight Chance Rain Showers

    • 50
    • 81

    Mostly Sunny

    • 53
    • 86

    Mostly Sunny

    • 54
    • 88

    Partly Sunny

    • 51
    • 83

    Partly Sunny

Today 5 Sep Lower Columbia Basin of Washington

Partly cloudy with a 20 percent chance of rain Showers in the Morning, then mostly cloudy in the afternoon. Highs in the lower to mid 70s. Light Wind, becoming north 5 to 10 Mph in the afternoon.

Tonight 5 Sep Lower Columbia Basin of Washington

Mostly cloudy. Lows in the upper 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

    55.7 °F

  • Average September

    67.2 °F

  • Highest 1 September, 2026

    85.6 °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