S
M
T
W
T
F
S
30
76°
46°
31
75°
45°
1
75°
41°
2
73°
46°
3
74°
48°
4
74°
41°
5
70°
41°
6
72°
40°
7
72°
43°
8
73°
42°
9
72°
41°
10
73°
40°
11
70°
43°
12
69°
38°
13
70°
41°
14
71°
44°
15
Hist. Avg.
74°
43°
16
Hist. Avg.
74°
43°
17
Hist. Avg.
74°
42°
18
Hist. Avg.
73°
42°
19
Hist. Avg.
73°
42°
20
Hist. Avg.
72°
41°
21
Hist. Avg.
72°
41°
22
Hist. Avg.
71°
41°
23
Hist. Avg.
71°
40°
24
Hist. Avg.
70°
40°
25
Hist. Avg.
70°
40°
26
Hist. Avg.
69°
40°
27
Hist. Avg.
69°
39°
28
Hist. Avg.
68°
39°
29
Hist. Avg.
68°
38°
30
Hist. Avg.
67°
38°
1
Hist. Avg.
66°
38°
2
Hist. Avg.
66°
38°
3
Hist. Avg.
65°
37°
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 69° to 76°, with overnight lows between 38° and 48°. The average high for September is 72° with an average low of 43°. 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.
