S
M
T
W
T
F
S
30
94°
71°
31
93°
72°
1
93°
71°
2
92°
71°
3
93°
70°
4
93°
70°
5
91°
69°
6
92°
70°
7
91°
71°
8
87°
70°
9
89°
71°
10
91°
70°
11
91°
70°
12
90°
69°
13
86°
69°
14
86°
68°
15
87°
69°
16
85°
69°
17
85°
68°
18
86°
68°
19
85°
63°
20
83°
62°
21
83°
64°
22
84°
67°
23
86°
68°
24
85°
67°
25
87°
68°
26
86°
67°
27
88°
67°
28
86°
66°
29
86°
65°
30
86°
65°
1
86°
66°
2
Hist. Avg.
85°
60°
3
Hist. Avg.
84°
60°
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 83° to 94°, with overnight lows between 62° and 72°. The average high for September is 88° with an average low of 68°. 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.
