S
M
T
W
T
F
S
30
83°
75°
31
86°
75°
1
86°
75°
2
91°
75°
3
90°
77°
4
90°
77°
5
91°
77°
6
91°
75°
7
88°
75°
8
84°
73°
9
88°
75°
10
88°
77°
11
90°
75°
12
88°
73°
13
93°
77°
14
93°
79°
15
86°
77°
16
86°
70°
17
86°
67°
18
90°
72°
19
89°
73°
20
85°
74°
21
86°
72°
22
84°
70°
23
82°
67°
24
84°
69°
25
83°
66°
26
83°
64°
27
82°
70°
28
83°
68°
29
78°
69°
30
83°
72°
1
81°
68°
2
83°
73°
3
82°
72°
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 78° to 90°, with overnight lows between 64° and 74°. The average high for September is 84° with an average low of 70°. 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.
