S
M
T
W
T
F
S
30
87°
64°
31
82°
72°
1
93°
74°
2
77°
72°
3
89°
72°
4
89°
74°
5
84°
70°
6
83°
66°
7
82°
66°
8
85°
64°
9
89°
71°
10
90°
75°
11
81°
69°
12
83°
65°
13
85°
71°
14
78°
62°
15
79°
58°
16
83°
62°
17
84°
69°
18
87°
71°
19
78°
65°
20
78°
67°
21
75°
64°
22
63°
53°
23
67°
50°
24
65°
49°
25
73°
53°
26
69°
54°
27
72°
59°
28
73°
59°
29
74°
59°
30
75°
58°
1
72°
56°
2
71°
55°
3
69°
59°
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 75°, with overnight lows between 49° and 59°. The average high for September is 70° with an average low of 55°. 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.
