S
M
T
W
T
F
S
30
74°
50°
31
73°
50°
1
73°
51°
2
72°
50°
3
73°
51°
4
72°
49°
5
71°
49°
6
72°
50°
7
70°
51°
8
72°
54°
9
72°
49°
10
74°
48°
11
71°
48°
12
69°
49°
13
70°
51°
14
75°
53°
15
77°
52°
16
76°
54°
17
77°
55°
18
76°
53°
19
67°
45°
20
73°
49°
21
66°
46°
22
Hist. Avg.
70°
47°
23
Hist. Avg.
69°
46°
24
Hist. Avg.
69°
46°
25
Hist. Avg.
68°
45°
26
Hist. Avg.
68°
45°
27
Hist. Avg.
68°
44°
28
Hist. Avg.
67°
44°
29
Hist. Avg.
67°
44°
30
Hist. Avg.
66°
43°
1
Hist. Avg.
66°
43°
2
Hist. Avg.
65°
42°
3
Hist. Avg.
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Wheaton
Wheaton's September 2026 forecast shows daily high temperatures ranging from 66° to 77°, with overnight lows between 45° and 55°. The average high for September is 72° with an average low of 50°. 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.
