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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Seattle, WA
Content continues below
September
Average Temperature
High
21°
Feels 21
Low
12°
Feels 12
Average Precipitation
9 Days
Rain amount
45.3mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
21°
19
21°
20
20°
21
20°
22
19°
23
19°
24
22°
25
19°
26
18°
27
18°
28
18°
29
18°
30
18°
Forecast
Friday, September 18, 2026
Day
21°
Feels 21
Wind
11 km/h S
Gust
17 km/h
Humidity
60%
P.O.P
20%
Night
11°
Feels 11
Wind
8 km/h S
Gust
12 km/h
Humidity
100%
P.O.P
20%
Historical Averages
Sep 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.