S
M
T
W
T
F
S
30
90°
66°
31
94°
72°
1
96°
72°
2
97°
74°
3
102°
73°
4
96°
70°
5
88°
66°
6
84°
64°
7
83°
64°
8
86°
65°
9
87°
66°
10
94°
66°
11
84°
62°
12
81°
63°
13
81°
60°
14
82°
61°
15
81°
64°
16
77°
65°
17
78°
63°
18
78°
58°
19
76°
56°
20
75°
57°
21
77°
58°
22
79°
60°
23
81°
61°
24
82°
62°
25
81°
61°
26
79°
61°
27
78°
62°
28
78°
61°
29
80°
60°
30
77°
59°
1
73°
58°
2
73°
58°
3
76°
57°
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 102°, with overnight lows between 56° and 74°. The average high for September is 82° 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.
