S
M
T
W
T
F
S
30
83°
62°
31
84°
65°
1
87°
67°
2
87°
66°
3
86°
66°
4
87°
65°
5
87°
66°
6
86°
65°
7
81°
65°
8
86°
64°
9
85°
61°
10
86°
59°
11
81°
64°
12
84°
63°
13
85°
64°
14
83°
62°
15
84°
63°
16
84°
62°
17
79°
63°
18
Hist. Avg.
81°
59°
19
Hist. Avg.
80°
59°
20
Hist. Avg.
80°
59°
21
Hist. Avg.
80°
58°
22
Hist. Avg.
79°
58°
23
Hist. Avg.
79°
57°
24
Hist. Avg.
79°
57°
25
Hist. Avg.
78°
56°
26
Hist. Avg.
78°
56°
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 79° to 87°, with overnight lows between 59° and 67°. The average high for September is 84° with an average low of 64°. 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.
