S
M
T
W
T
F
S
30
83°
62°
31
83°
62°
1
84°
61°
2
79°
62°
3
81°
61°
4
81°
61°
5
83°
60°
6
83°
61°
7
84°
62°
8
85°
61°
9
81°
60°
10
77°
59°
11
82°
61°
12
83°
60°
13
83°
59°
14
72°
48°
15
71°
52°
16
72°
55°
17
73°
51°
18
70°
50°
19
73°
51°
20
78°
54°
21
78°
55°
22
77°
54°
23
77°
45°
24
70°
45°
25
70°
53°
26
74°
54°
27
75°
44°
28
74°
43°
29
66°
45°
30
68°
49°
1
68°
49°
2
70°
52°
3
74°
51°
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 66° to 85°, with overnight lows between 43° and 62°. The average high for September is 77° with an average low of 55°. 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.
