S
M
T
W
T
F
S
30
93°
68°
31
96°
71°
1
98°
72°
2
97°
73°
3
98°
74°
4
96°
73°
5
97°
69°
6
93°
70°
7
94°
70°
8
96°
71°
9
92°
69°
10
86°
63°
11
82°
59°
12
86°
63°
13
87°
62°
14
81°
63°
15
80°
63°
16
80°
62°
17
82°
62°
18
84°
61°
19
84°
62°
20
83°
62°
21
83°
61°
22
82°
61°
23
83°
60°
24
83°
61°
25
82°
60°
26
82°
60°
27
83°
59°
28
83°
59°
29
82°
58°
30
82°
59°
1
81°
58°
2
81°
58°
3
80°
57°
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 80° to 98°, with overnight lows between 57° and 74°. The average high for September is 87° with an average low of 64°. 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.
