S
M
T
W
T
F
S
30
71°
53°
31
71°
53°
1
72°
57°
2
72°
56°
3
73°
56°
4
72°
59°
5
72°
59°
6
77°
60°
7
77°
59°
8
76°
58°
9
73°
57°
10
73°
58°
11
74°
58°
12
72°
57°
13
71°
56°
14
67°
56°
15
67°
55°
16
66°
54°
17
66°
53°
18
70°
54°
19
69°
54°
20
70°
53°
21
76°
53°
22
76°
47°
23
72°
44°
24
66°
46°
25
65°
49°
26
63°
52°
27
71°
52°
28
71°
51°
29
72°
49°
30
72°
49°
1
71°
50°
2
70°
50°
3
71°
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 63° to 77°, with overnight lows between 44° and 60°. The average high for September is 71° with an average low of 54°. 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.
