S
M
T
W
T
F
S
30
86°
65°
31
81°
65°
1
80°
66°
2
80°
65°
3
81°
69°
4
80°
64°
5
84°
64°
6
80°
63°
7
79°
62°
8
78°
63°
9
78°
62°
10
80°
67°
11
83°
67°
12
78°
67°
13
78°
67°
14
82°
67°
15
Hist. Avg.
79°
61°
16
Hist. Avg.
78°
61°
17
Hist. Avg.
78°
60°
18
Hist. Avg.
78°
60°
19
Hist. Avg.
78°
60°
20
Hist. Avg.
77°
59°
21
Hist. Avg.
77°
59°
22
Hist. Avg.
77°
58°
23
Hist. Avg.
76°
58°
24
Hist. Avg.
76°
58°
25
Hist. Avg.
76°
57°
26
Hist. Avg.
75°
57°
27
Hist. Avg.
75°
57°
28
Hist. Avg.
75°
56°
29
Hist. Avg.
74°
56°
30
Hist. Avg.
74°
56°
1
Hist. Avg.
74°
55°
2
Hist. Avg.
73°
55°
3
Hist. Avg.
73°
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 86°, with overnight lows between 62° and 69°. The average high for September is 81° with an average low of 65°. 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.
