S
M
T
W
T
F
S
30
75°
56°
31
75°
59°
1
81°
60°
2
81°
58°
3
80°
53°
4
80°
58°
5
79°
53°
6
79°
52°
7
72°
55°
8
71°
57°
9
72°
52°
10
78°
49°
11
72°
56°
12
73°
51°
13
77°
52°
14
73°
49°
15
70°
55°
16
74°
48°
17
Hist. Avg.
74°
54°
18
Hist. Avg.
74°
53°
19
Hist. Avg.
73°
53°
20
Hist. Avg.
73°
52°
21
Hist. Avg.
73°
52°
22
Hist. Avg.
72°
52°
23
Hist. Avg.
72°
51°
24
Hist. Avg.
71°
51°
25
Hist. Avg.
71°
50°
26
Hist. Avg.
70°
50°
27
Hist. Avg.
70°
50°
28
Hist. Avg.
70°
49°
29
Hist. Avg.
69°
49°
30
Hist. Avg.
69°
48°
1
Hist. Avg.
68°
48°
2
Hist. Avg.
68°
47°
3
Hist. Avg.
67°
47°
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 70° to 81°, with overnight lows between 48° and 60°. 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.
