Weather in Seattle: September
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Average day temperature: | 69.9°F |
| Average night temperature: | 56.6°F | |
 |
Number of sunny days: | 14 days |
| Day length: | 11.7 - 13.4 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 1.0 in. | |
| more information | ||
14 days
forecast
forecast
| Seattle |
weather in
October
October
| Seattle |
Air temperature in September, °F
Show year:
2026
2025
2024
The highest day temperature during September of 2026 was 74°F. At the same time the lowest night temperature was 47°F. Daily and nightly averages during September were 65.4°F and 53.8°F.
Sunny, partly cloudy and cloudy days
Number of sunny, partly cloudy and cloudy days in September is almost equal.
Precipitation total in September, in.
Precipitation total value in Seattle in September is 1.0 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 4.6 mph It makes September one of the least windy months of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 6.9.
Best time for vacation in Seattle
Seattle on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Seattle
Local time: 07:44
October 04, sunday
0900
59°F
S
1 mph
1 mph
1200
70°F
S
3 mph
3 mph
1500
75°F
SE
4 mph
4 mph
1800
70°F
S
6 mph
6 mph
2100
61°F
S
3 mph
3 mph
October 05, monday
0000
59°F
S
2 mph
2 mph
0300
55°F
SW
0 mph
0 mph
0600
54°F
NE
1 mph
1 mph
