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7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Arlington Heights, IL
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September
Average Temperature
High
24°
Feels 25
Low
14°
Feels 13
Average Precipitation
9 Days
Rain amount
70.3mm
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
23°
18
21°
19
23°
20
20°
21
17°
22
17°
23
18°
24
19°
25
19°
26
19°
27
20°
28
20°
29
20°
30
20°
Forecast
Thursday, September 17, 2026
Day
23°
Feels 23
Wind
15 km/h N
Gust
23 km/h
Humidity
85%
P.O.P
100%
Rain
5-10 mm
Night
18°
Feels 18
Wind
19 km/h NE
Gust
29 km/h
Humidity
94%
P.O.P
40%
Rain
<1 mm
Historical Averages
Sep 17
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.