S
M
T
W
T
F
S
30
72°
58°
31
73°
59°
1
77°
53°
2
71°
53°
3
72°
54°
4
72°
52°
5
71°
51°
6
74°
55°
7
74°
55°
8
72°
56°
9
76°
56°
10
73°
55°
11
73°
55°
12
75°
54°
13
75°
55°
14
76°
55°
15
76°
54°
16
75°
50°
17
73°
53°
18
66°
55°
19
73°
54°
20
74°
54°
21
73°
51°
22
72°
45°
23
67°
44°
24
Hist. Avg.
73°
49°
25
Hist. Avg.
73°
49°
26
Hist. Avg.
72°
48°
27
Hist. Avg.
72°
48°
28
Hist. Avg.
72°
47°
29
Hist. Avg.
71°
47°
30
Hist. Avg.
71°
47°
1
Hist. Avg.
70°
46°
2
Hist. Avg.
70°
46°
3
Hist. Avg.
70°
45°
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 77°, with overnight lows between 44° and 59°. The average high for September is 73° with an average low of 53°. 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.
