Seattle in september: average Weather, Temperature and Climate
Weather in Seattle in september 2025
The weather in Seattle in the month of september comes from statistical datas on the past years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
perfect weather
Weather at 6am
58°F
Clear/Sunny
44% of time
20%
16%
8%
Weather at 12pm
72°F
Clear/Sunny
51% of time
24%
17%
6%
Weather at 6pm
61°F
Clear/Sunny
47% of time
22%
20%
6%
Weather at 3am
56°F
39%
24%
19%
13%
Evolution of daily average temperature and precipitation in Seattle in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Seattle in september.
The climate of Seattle in september is perfect
In september in Seattle, the climate is quite dry (with 1.4in of rainfall over 2 days). The situation is deteriorating compared to the previous month since in august there is an average of 0.6in of rainfall over 1 days.
The climate comfortable in that locality the month of september. The thermometer averaged maximum of 74°F. In the morning the temperature drops to 58°F. Thus, the mean temperature average on this month of september in Seattle is 67°F. Note that these seasonal averages are in contrast with those observed in Seattle in september with a maximum record of 97°F in 2017 and a minimum record of 41°F in 2019. You can expect to have about 26 days with temperatures over 65°F, or 87% of the month. And about 3 days with temperatures above 86°F.
On average, in Seattle, the days of september last 12:33. The sun rises at 05:47 and sunset is at 18:20.
With a good weather, september is recommended to go in this locality.
Seasonal average climate and temperature of Seattle in september
Check below seasonal norms These datas are compiled from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 67°F | ||||
| Highest temperature | 74°F | ||||
| Lowest temperature | 58°F | ||||
| Highest record temperature | 97°F (2017) | ||||
| Lowest record temperature | 41°F (2019) | ||||
| Number of days at +86°F | 3 day(s) (10%) | ||||
| Number of days at +65°F | 26 day(s) (87%) | ||||
| Sea temperature | |||||
| Average sea temperature | 54°F | ||||
| Lowest sea temperature | 52°F | ||||
| Highest sea temperature | 56°F | ||||
| Wind | |||||
| Wind speed | 10km/h | ||||
| Wind temperature | 58°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 1.4in | ||||
| Number of days with rainfall | 2 day(s) (7%) | ||||
| Record daily rainfall | 0.8in (2013) | ||||
| Other climate data | |||||
| Humidity | 84% | ||||
| Visibility | 9.1km | ||||
| Cloud cover | 32% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:47 | ||||
| Time of sunset | 18:20 | ||||
| Length of day | 12:33 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | perfect | ||||
How was the weather last september?
Here is the day by day recorded weather in Seattle in september 2024:
59°F to 83°F
59°F to 79°F
59°F to 76°F
54°F to 77°F
58°F to 86°F
61°F to 85°F
59°F to 81°F
59°F to 85°F
56°F to 72°F
54°F to 72°F
54°F to 58°F
54°F to 65°F
50°F to 70°F
56°F to 70°F
50°F to 65°F
49°F to 70°F
54°F to 59°F
56°F to 59°F
52°F to 63°F
50°F to 63°F
47°F to 67°F
52°F to 67°F
61°F to 72°F
56°F to 74°F
61°F to 65°F
54°F to 59°F
56°F to 63°F
49°F to 58°F
49°F to 58°F
45°F to 59°F
Map: other cities in the United States (USA) in september
Cities near Seattle:
| Mount Rainier National Park (Washington) in september | tolerable weather |
| Westport (Washington) in september | good weather |
| La Push (Washington) in september | good weather |
| Ocean Park (Washington) in september | good weather |
| Long Beach (Washington) in september | good weather |
| Portland in september | good weather |
| Salem (Oregon) in september | perfect weather |
| Lincoln City (Oregon) in september | good weather |
| Newport (Oregon) in september | good weather |
| Coos Bay in september | good weather |
| Crater Lake (Oregon) in september | tolerable weather |
| Glacier National Park (Montana) in september | very bad weather |
Click over cities on the map for information about the weather in september.
Seattle
perfect weather
good
tolerable
bad
very bad
Weather data for Seattle in september:
Weather data for Seattle for september are derived from an average of the weather forecast since 2009 in Seattle. There is a margin of error and these forecasts are to be considered as general information only. The weather in Seattle can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Seattle.