Weather in Tri-Cities in September
In an average September, Tri-Cities sees a daily high around 83°F and a low around 54°F, based on 1980–2026 of local climate records.
| Average high | 83°F |
|---|---|
| Typical high range | 72°F to 93°F |
| Average low | 54°F |
| Typical low range | 47°F to 62°F |
| Average daily precipitation | 0.00 in |
September records
The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
105°F
2022-09-03
Lowest
50°F
2019-09-29
Low
Highest
73°F
2019-09-06
Lowest
33°F
1985-09-29
Feels-like
Highest
118°F
2025-09-04
Lowest
24°F
2000-09-23
Humidity
Highest
14.8 g/m³
2023-09-01
Lowest
3.2 g/m³
1985-09-28
Wind
Highest
25 mph
2020-09-07
Lowest
3 mph
2017-09-26
Gust
Highest
49 mph
2020-09-07
Lowest
9 mph
2025-09-28
Precip
Wettest
1.51 in
1985
Driest
0.00 in
1991
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