S
M
T
W
T
F
S
30
72°
54°
31
71°
53°
1
70°
55°
2
71°
58°
3
70°
59°
4
71°
54°
5
72°
54°
6
71°
53°
7
70°
51°
8
71°
52°
9
70°
58°
10
69°
53°
11
69°
50°
12
70°
51°
13
69°
51°
14
71°
55°
15
72°
56°
16
74°
56°
17
74°
55°
18
72°
49°
19
72°
54°
20
71°
48°
21
66°
50°
22
66°
53°
23
71°
53°
24
70°
54°
25
71°
52°
26
70°
45°
27
66°
47°
28
63°
46°
29
62°
45°
30
61°
44°
1
63°
44°
2
60°
43°
3
Hist. Avg.
64°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westmont
Westmont's September 2026 forecast shows daily high temperatures ranging from 60° to 74°, with overnight lows between 43° and 59°. The average high for September is 69° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Westmont. See also: October | November | December.
