S
M
T
W
T
F
S
30
86°
70°
31
90°
68°
1
94°
70°
2
95°
72°
3
97°
71°
4
96°
72°
5
95°
70°
6
86°
69°
7
84°
66°
8
86°
65°
9
90°
65°
10
92°
66°
11
93°
65°
12
89°
65°
13
87°
66°
14
87°
64°
15
88°
64°
16
87°
62°
17
79°
65°
18
77°
65°
19
78°
65°
20
78°
64°
21
79°
64°
22
80°
65°
23
82°
64°
24
77°
63°
25
76°
64°
26
79°
63°
27
82°
61°
28
80°
54°
29
73°
53°
30
73°
53°
1
74°
55°
2
74°
59°
3
73°
58°
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 73° to 97°, with overnight lows between 53° and 72°. The average high for September is 83° 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.
