S
M
T
W
T
F
S
30
83°
62°
31
83°
67°
1
87°
62°
2
88°
60°
3
82°
61°
4
83°
62°
5
82°
65°
6
87°
65°
7
87°
66°
8
86°
65°
9
86°
65°
10
85°
64°
11
86°
64°
12
85°
65°
13
85°
63°
14
86°
62°
15
81°
61°
16
78°
60°
17
80°
57°
18
78°
57°
19
81°
58°
20
82°
62°
21
83°
61°
22
77°
57°
23
81°
60°
24
80°
61°
25
81°
55°
26
81°
59°
27
Hist. Avg.
78°
56°
28
Hist. Avg.
77°
55°
29
Hist. Avg.
77°
55°
30
Hist. Avg.
76°
54°
1
Hist. Avg.
76°
54°
2
Hist. Avg.
76°
53°
3
Hist. Avg.
75°
53°
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 77° to 88°, with overnight lows between 55° and 67°. The average high for September is 83° with an average low of 62°. 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.
