S
M
T
W
T
F
S
30
68°
51°
31
76°
51°
1
87°
51°
2
84°
51°
3
79°
43°
4
75°
53°
5
73°
48°
6
66°
54°
7
56°
50°
8
59°
44°
9
75°
52°
10
77°
46°
11
62°
42°
12
53°
38°
13
48°
39°
14
60°
41°
15
62°
40°
16
61°
43°
17
64°
41°
18
60°
39°
19
60°
40°
20
70°
39°
21
70°
46°
22
63°
46°
23
63°
45°
24
73°
45°
25
74°
44°
26
74°
45°
27
72°
43°
28
65°
38°
29
58°
34°
30
59°
41°
1
61°
35°
2
61°
41°
3
68°
41°
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 48° to 77°, with overnight lows between 34° and 52°. The average high for September is 64° with an average low of 42°. 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.
