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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Janesville, WI
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September
Average Temperature
High
24°
Feels 24
Low
12°
Feels 11
Average Precipitation
9 Days
Rain amount
67.4mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
33°
3
32°
4
30°
5
28°
6
27°
7
26°
8
27°
9
28°
10
24°
11
24°
12
24°
13
25°
14
25°
15
24°
16
23°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Wednesday, September 2, 2026
Day
33°
Feels 37
Wind
22 km/h SW
Gust
33 km/h
Humidity
53%
P.O.P
20%
Night
22°
Feels 22
Wind
10 km/h W
Gust
15 km/h
Humidity
94%
P.O.P
40%
Rain
~1 mm
Historical Averages
Sep 2
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.