S
M
T
W
T
F
S
30
73°
53°
31
75°
55°
1
78°
56°
2
79°
54°
3
78°
49°
4
78°
55°
5
77°
52°
6
76°
48°
7
70°
52°
8
68°
53°
9
70°
47°
10
74°
44°
11
69°
53°
12
72°
46°
13
76°
51°
14
72°
49°
15
68°
52°
16
68°
44°
17
67°
45°
18
Hist. Avg.
75°
50°
19
Hist. Avg.
74°
50°
20
Hist. Avg.
74°
49°
21
Hist. Avg.
73°
49°
22
Hist. Avg.
73°
49°
23
Hist. Avg.
72°
48°
24
Hist. Avg.
72°
48°
25
Hist. Avg.
72°
48°
26
Hist. Avg.
71°
47°
27
Hist. Avg.
71°
47°
28
Hist. Avg.
70°
46°
29
Hist. Avg.
70°
46°
30
Hist. Avg.
70°
46°
1
Hist. Avg.
69°
45°
2
Hist. Avg.
69°
45°
3
Hist. Avg.
68°
44°
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 67° to 79°, with overnight lows between 44° and 56°. The average high for September is 73° with an average low of 50°. 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.
