Tri-Cities Airport Weather Forecast
- 45
- 74
Increasing Clouds
- 46
- 70
Mostly Cloudy
- 48
- 79
Sunny
- 49
- 82
Mostly Sunny
- 50
- 83
Mostly Sunny
- 50
- 84
Mostly Sunny
Today 14 Sep Lower Columbia Basin of Washington
Sunny. Highs in the upper 60s to lower 70s. Southwest wind 5 to 10 Mph with Gusts to around 20 Mph.
Tonight 14 Sep Lower Columbia Basin of Washington
Mostly clear. Lows in the mid to upper 40s. Southwest wind 5 to 15 Mph.
Tri-Cities Airport Temperature Statistics
September Temperature
Tri-Cities Airport (0 miles)
Lowest 8 September, 2026
44.7 °FAverage September
66.1 °FHighest 10 September, 2026
89.1 °F
Climate (2021–2026)
Tri-Cities Airport (0 miles)
Average Low 2021–2026
42.8 °FAverage 2021–2026
55.4 °FAverage High 2021–2026
67.9 °F