S
M
T
W
T
F
S
30
90°
66°
31
89°
67°
1
90°
66°
2
89°
66°
3
90°
65°
4
90°
66°
5
91°
67°
6
90°
64°
7
87°
60°
8
83°
62°
9
84°
63°
10
87°
59°
11
87°
59°
12
86°
60°
13
85°
61°
14
87°
63°
15
86°
62°
16
86°
59°
17
83°
56°
18
80°
56°
19
78°
60°
20
79°
55°
21
79°
54°
22
77°
56°
23
78°
59°
24
77°
59°
25
80°
60°
26
83°
59°
27
80°
58°
28
82°
59°
29
82°
58°
30
77°
57°
1
76°
56°
2
79°
50°
3
75°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chesterfield
Chesterfield's September 2026 forecast shows daily high temperatures ranging from 75° to 91°, with overnight lows between 49° and 67°. The average high for September is 83° 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 Chesterfield. See also: October | November | December.
