S
M
T
W
T
F
S
30
82°
65°
31
83°
69°
1
86°
69°
2
87°
68°
3
87°
66°
4
85°
69°
5
86°
67°
6
85°
67°
7
82°
66°
8
79°
67°
9
83°
61°
10
82°
60°
11
78°
67°
12
82°
64°
13
85°
65°
14
80°
64°
15
83°
65°
16
82°
66°
17
Hist. Avg.
79°
61°
18
Hist. Avg.
78°
60°
19
Hist. Avg.
78°
60°
20
Hist. Avg.
78°
60°
21
Hist. Avg.
77°
59°
22
Hist. Avg.
77°
59°
23
Hist. Avg.
76°
58°
24
Hist. Avg.
76°
58°
25
Hist. Avg.
76°
58°
26
Hist. Avg.
75°
57°
27
Hist. Avg.
75°
57°
28
Hist. Avg.
74°
56°
29
Hist. Avg.
74°
56°
30
Hist. Avg.
74°
56°
1
Hist. Avg.
73°
55°
2
Hist. Avg.
73°
55°
3
Hist. Avg.
72°
54°
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 78° to 87°, with overnight lows between 60° and 69°. The average high for September is 83° with an average low of 66°. 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.
