S
M
T
W
T
F
S
30
81°
68°
31
87°
70°
1
93°
73°
2
94°
73°
3
91°
74°
4
91°
75°
5
82°
71°
6
80°
62°
7
81°
58°
8
85°
62°
9
80°
67°
10
77°
57°
11
81°
53°
12
86°
61°
13
73°
51°
14
70°
46°
15
83°
63°
16
75°
66°
17
77°
66°
18
74°
65°
19
82°
64°
20
69°
63°
21
66°
58°
22
69°
52°
23
72°
53°
24
70°
55°
25
73°
52°
26
74°
53°
27
73°
55°
28
74°
54°
29
71°
47°
30
73°
55°
1
74°
53°
2
67°
52°
3
64°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wheaton
Wheaton's September 2026 forecast shows daily high temperatures ranging from 64° to 82°, with overnight lows between 47° and 66°. The average high for September is 72° with an average low of 56°. 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 Wheaton. See also: October | November | December.
