S
M
T
W
T
F
S
30
82°
66°
31
84°
63°
1
80°
54°
2
84°
63°
3
90°
61°
4
84°
63°
5
86°
64°
6
77°
66°
7
77°
64°
8
88°
61°
9
79°
52°
10
84°
46°
11
86°
61°
12
70°
48°
13
70°
45°
14
61°
45°
15
72°
50°
16
72°
41°
17
73°
50°
18
63°
57°
19
63°
55°
20
66°
48°
21
64°
48°
22
66°
46°
23
72°
48°
24
66°
61°
25
66°
59°
26
62°
57°
27
70°
56°
28
69°
57°
29
64°
51°
30
71°
51°
1
71°
49°
2
68°
50°
3
63°
44°
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 62° to 71°, with overnight lows between 44° and 59°. The average high for September is 67° with an average low of 53°. 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.
