Tri-Cities Airport Weather Forecast
- 50
- 76
Mostly Cloudy
- 48
- 77
Partly Sunny
- 49
- 80
Mostly Sunny
- 53
- 86
Mostly Sunny
- 55
- 89
Mostly Sunny
- 49
- 82
Partly Sunny
Today 6 Sep Lower Columbia Basin of Washington
Mostly cloudy. A chance of rain Showers. Highs in the lower to mid 70s. Light Wind, becoming northwest 5 to 10 Mph in the afternoon. Chance of precipitation 50 percent.
Tonight 6 Sep Lower Columbia Basin of Washington
Mostly cloudy with a 20 percent chance of rain Showers. Lows in the upper 40s to mid 50s. Southwest wind 5 to 10 Mph.
Tri-Cities Airport Temperature Statistics
September Temperature
Tri-Cities Airport (0 miles)
Lowest 4 September, 2026
46 °FAverage September
66.4 °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