S
M
T
W
T
F
S
30
69°
50°
31
69°
49°
1
68°
52°
2
70°
52°
3
68°
53°
4
68°
53°
5
65°
50°
6
66°
50°
7
67°
48°
8
64°
53°
9
65°
49°
10
67°
48°
11
64°
50°
12
63°
52°
13
63°
52°
14
64°
51°
15
67°
51°
16
67°
47°
17
68°
51°
18
67°
51°
19
Hist. Avg.
60°
50°
20
Hist. Avg.
60°
50°
21
Hist. Avg.
60°
50°
22
Hist. Avg.
60°
50°
23
Hist. Avg.
60°
50°
24
Hist. Avg.
59°
49°
25
Hist. Avg.
59°
49°
26
Hist. Avg.
59°
49°
27
Hist. Avg.
59°
49°
28
Hist. Avg.
59°
49°
29
Hist. Avg.
59°
49°
30
Hist. Avg.
59°
48°
1
Hist. Avg.
58°
48°
2
Hist. Avg.
58°
48°
3
Hist. Avg.
58°
48°
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 63° to 70°, with overnight lows between 47° and 53°. The average high for September is 66° with an average low of 51°. 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.
