S
M
T
W
T
F
S
30
85°
72°
31
86°
72°
1
85°
71°
2
82°
69°
3
79°
68°
4
78°
67°
5
78°
65°
6
78°
65°
7
83°
70°
8
81°
70°
9
80°
69°
10
84°
70°
11
85°
70°
12
84°
69°
13
85°
70°
14
83°
68°
15
83°
64°
16
81°
63°
17
77°
62°
18
76°
61°
19
75°
60°
20
75°
60°
21
77°
63°
22
79°
66°
23
81°
61°
24
81°
61°
25
75°
62°
26
75°
60°
27
76°
62°
28
78°
64°
29
79°
59°
30
78°
62°
1
73°
64°
2
76°
63°
3
78°
62°
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 73° to 86°, with overnight lows between 59° and 72°. The average high for September is 80° with an average low of 65°. 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.
