Weather in Seattle in September
In an average September, Seattle sees a daily high around 71°F and a low around 54°F, based on 1980–2026 of local climate records.
| Average high | 71°F |
|---|---|
| Typical high range | 64°F to 79°F |
| Average low | 54°F |
| Typical low range | 49°F to 59°F |
| Average daily precipitation | 0.10 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
91°F
1988-09-02
Lowest
54°F
2007-09-30
Low
Highest
64°F
2017-09-08
Lowest
38°F
1983-09-29
Feels-like
Highest
105°F
1988-09-02
Lowest
31°F
1983-09-29
Humidity
Highest
16.7 g/m³
2013-09-12
Lowest
5.5 g/m³
1985-09-29
Wind
Highest
21 mph
2013-09-28
Lowest
3 mph
1981-09-25
Gust
Highest
61 mph
2013-09-28
Lowest
8 mph
2004-09-22
Precip
Wettest
8.04 in
2013
Driest
0.24 in
1993
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