S
M
T
W
T
F
S
30
80°
57°
31
78°
56°
1
77°
58°
2
79°
59°
3
78°
56°
4
79°
56°
5
78°
58°
6
79°
61°
7
77°
55°
8
78°
54°
9
75°
59°
10
79°
53°
11
76°
52°
12
75°
52°
13
75°
54°
14
77°
58°
15
81°
58°
16
82°
59°
17
81°
58°
18
81°
56°
19
80°
48°
20
73°
49°
21
71°
54°
22
72°
55°
23
76°
55°
24
77°
56°
25
78°
48°
26
77°
46°
27
74°
47°
28
69°
46°
29
69°
46°
30
68°
51°
1
69°
54°
2
Hist. Avg.
72°
48°
3
Hist. Avg.
71°
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 68° to 82°, with overnight lows between 46° and 61°. The average high for September is 76° with an average low of 54°. 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.
