S
M
T
W
T
F
S
30
90°
66°
31
89°
65°
1
95°
69°
2
96°
70°
3
99°
70°
4
93°
70°
5
85°
63°
6
83°
60°
7
85°
61°
8
81°
60°
9
82°
61°
10
82°
62°
11
85°
59°
12
83°
60°
13
83°
57°
14
82°
58°
15
79°
62°
16
75°
62°
17
74°
58°
18
74°
54°
19
73°
52°
20
73°
54°
21
76°
54°
22
78°
56°
23
80°
59°
24
81°
59°
25
79°
57°
26
77°
57°
27
76°
58°
28
75°
57°
29
79°
56°
30
74°
54°
1
70°
50°
2
70°
52°
3
74°
54°
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 70° to 99°, with overnight lows between 50° and 70°. The average high for September is 80° with an average low of 59°. 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.
