S
M
T
W
T
F
S
30
80°
59°
31
81°
59°
1
78°
60°
2
78°
62°
3
79°
64°
4
79°
59°
5
82°
58°
6
80°
60°
7
79°
57°
8
78°
56°
9
78°
59°
10
77°
62°
11
81°
56°
12
77°
55°
13
77°
54°
14
78°
55°
15
79°
60°
16
81°
60°
17
80°
54°
18
76°
52°
19
75°
54°
20
75°
57°
21
76°
52°
22
75°
54°
23
78°
55°
24
79°
56°
25
80°
57°
26
79°
49°
27
78°
49°
28
73°
48°
29
73°
47°
30
72°
47°
1
72°
48°
2
69°
46°
3
Hist. Avg.
74°
47°
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 69° to 82°, with overnight lows between 46° and 64°. The average high for September is 77° with an average low of 55°. 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.
