Weather in Seattle in September
In an average September, Seattle sees a daily high around 70°F and a low around 50°F, based on 1980–2026 of local climate records.
| Average high | 70°F |
|---|---|
| Typical high range | 62°F to 81°F |
| Average low | 50°F |
| Typical low range | 44°F to 56°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
99°F
1988-09-02
Lowest
52°F
2007-09-30
Low
Highest
63°F
2017-09-05
Lowest
31°F
1983-09-29
Feels-like
Highest
126°F
1988-09-02
Lowest
23°F
1983-09-29
Humidity
Highest
16.4 g/m³
2013-09-12
Lowest
4.4 g/m³
2020-09-08
Wind
Highest
16 mph
2013-09-29
Lowest
3 mph
1980-09-13
Gust
Highest
62 mph
2013-09-28
Lowest
9 mph
1980-09-13
Precip
Wettest
9.11 in
2013
Driest
0.26 in
1993
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