S
M
T
W
T
F
S
30
75°
42°
31
72°
48°
1
80°
45°
2
77°
49°
3
80°
49°
4
81°
50°
5
82°
47°
6
82°
39°
7
70°
46°
8
74°
45°
9
69°
44°
10
68°
45°
11
71°
48°
12
77°
47°
13
76°
46°
14
77°
40°
15
71°
37°
16
66°
40°
17
Hist. Avg.
65°
41°
18
Hist. Avg.
65°
41°
19
Hist. Avg.
64°
40°
20
Hist. Avg.
64°
40°
21
Hist. Avg.
64°
40°
22
Hist. Avg.
63°
39°
23
Hist. Avg.
63°
39°
24
Hist. Avg.
63°
39°
25
Hist. Avg.
62°
39°
26
Hist. Avg.
62°
38°
27
Hist. Avg.
62°
38°
28
Hist. Avg.
61°
38°
29
Hist. Avg.
61°
37°
30
Hist. Avg.
61°
37°
1
Hist. Avg.
61°
37°
2
Hist. Avg.
60°
36°
3
Hist. Avg.
60°
36°
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 66° to 82°, with overnight lows between 37° and 50°. The average high for September is 75° with an average low of 45°. 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.
