S
M
T
W
T
F
S
30
75°
57°
31
76°
56°
1
74°
57°
2
74°
58°
3
73°
59°
4
72°
58°
5
73°
58°
6
74°
57°
7
72°
56°
8
73°
54°
9
71°
55°
10
72°
61°
11
71°
54°
12
71°
54°
13
74°
53°
14
74°
60°
15
73°
60°
16
72°
56°
17
69°
53°
18
69°
52°
19
70°
54°
20
74°
58°
21
71°
55°
22
68°
55°
23
73°
58°
24
71°
57°
25
73°
56°
26
66°
49°
27
69°
50°
28
64°
49°
29
63°
48°
30
65°
49°
1
64°
48°
2
Hist. Avg.
67°
48°
3
Hist. Avg.
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chester
Chester's September 2026 forecast shows daily high temperatures ranging from 63° to 76°, with overnight lows between 48° and 61°. The average high for September is 71° with an average low of 55°. 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.
