S
M
T
W
T
F
S
30
83°
69°
31
87°
71°
1
95°
77°
2
96°
78°
3
91°
79°
4
96°
73°
5
83°
67°
6
82°
66°
7
82°
67°
8
87°
72°
9
87°
68°
10
80°
61°
11
77°
62°
12
79°
63°
13
82°
66°
14
80°
61°
15
80°
60°
16
81°
61°
17
75°
56°
18
71°
61°
19
76°
62°
20
76°
61°
21
75°
61°
22
75°
59°
23
71°
59°
24
73°
57°
25
76°
59°
26
76°
54°
27
66°
49°
28
64°
47°
29
65°
50°
30
64°
47°
1
63°
49°
2
66°
55°
3
65°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Des Plaines
Des Plaines's September 2026 forecast shows daily high temperatures ranging from 63° to 96°, with overnight lows between 47° and 73°. The average high for September is 76° with an average low of 60°. 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 Des Plaines. See also: October | November | December.
