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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Renton, WA
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September
Average Temperature
High
21°
Feels 21
Low
12°
Feels 12
Average Precipitation
9 Days
Rain amount
49.5mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
18°
4
20°
5
20°
6
21°
7
20°
8
20°
9
23°
10
23°
11
21°
12
20°
13
21°
14
20°
15
21°
16
21°
17
21°
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Thursday, September 3, 2026
Day
18°
Feels 18
Wind
12 km/h SE
Gust
18 km/h
Humidity
64%
P.O.P
70%
Rain
1-3 mm
Night
11°
Feels 11
Wind
6 km/h NE
Gust
9 km/h
Humidity
100%
P.O.P
40%
Rain
<1 mm
Historical Averages
Sep 3
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.