S
M
T
W
T
F
S
30
80°
54°
31
77°
64°
1
87°
68°
2
70°
66°
3
88°
67°
4
87°
68°
5
81°
62°
6
80°
58°
7
80°
52°
8
82°
51°
9
85°
56°
10
87°
67°
11
82°
55°
12
82°
50°
13
83°
64°
14
76°
49°
15
74°
46°
16
82°
52°
17
82°
64°
18
83°
60°
19
74°
62°
20
69°
61°
21
74°
61°
22
68°
56°
23
69°
54°
24
68°
47°
25
N/A
26
59°
54°
27
59°
56°
28
60°
54°
29
70°
51°
30
69°
52°
1
73°
55°
2
72°
52°
3
69°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Chester
Chester's September 2026 forecast shows daily high temperatures ranging from 59° to 73°, with overnight lows between 51° and 56°. The average high for September is 66° with an average low of 53°. 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.
