S
M
T
W
T
F
S
30
87°
70°
31
87°
70°
1
86°
67°
2
80°
63°
3
79°
62°
4
79°
62°
5
80°
63°
6
83°
66°
7
85°
68°
8
85°
68°
9
83°
67°
10
85°
68°
11
86°
67°
12
85°
68°
13
86°
69°
14
85°
59°
15
77°
59°
16
75°
58°
17
77°
59°
18
83°
64°
19
84°
65°
20
84°
65°
21
81°
60°
22
82°
55°
23
73°
58°
24
72°
61°
25
74°
62°
26
78°
62°
27
79°
61°
28
79°
61°
29
78°
60°
30
79°
61°
1
78°
60°
2
78°
54°
3
76°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chester
Chester's September 2026 forecast shows daily high temperatures ranging from 72° to 87°, with overnight lows between 51° and 70°. The average high for September is 81° with an average low of 63°. 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 Chester. See also: October | November | December.
