Tri-Cities Airport Weather Forecast
- 46
- 75
Mostly Cloudy
- 49
- 74
Chance Rain Showers
- 47
- 78
Chance Rain Showers
- 50
- 81
Mostly Sunny
- 52
- 87
Mostly Sunny
- 53
- 88
Partly Sunny
Today 5 Sep Lower Columbia Basin of Washington
Partly cloudy. A 20 percent chance of rain Showers in the morning. Highs in the lower to mid 70s. Light wind.
Tonight 5 Sep Lower Columbia Basin of Washington
Mostly cloudy with a 20 percent chance of rain Showers. Lows in the mid 40s to lower 50s. Light wind.
Tri-Cities Airport Temperature Statistics
September Temperature
Tri-Cities Airport (0 miles)
Lowest 1 September, 2026
55.7 °FAverage September
67.2 °FHighest 1 September, 2026
85.6 °F
Climate (2021–2026)
Tri-Cities Airport (0 miles)
Average Low 2021–2026
42.8 °FAverage 2021–2026
55.4 °FAverage High 2021–2026
68 °F