S
M
T
W
T
F
S
30
77°
58°
31
80°
59°
1
76°
52°
2
77°
53°
3
75°
52°
4
75°
50°
5
76°
51°
6
76°
57°
7
79°
55°
8
75°
54°
9
75°
56°
10
76°
51°
11
76°
57°
12
79°
57°
13
78°
56°
14
81°
55°
15
79°
55°
16
79°
54°
17
73°
55°
18
79°
55°
19
78°
54°
20
76°
53°
21
77°
46°
22
76°
45°
23
75°
51°
24
75°
52°
25
68°
48°
26
Hist. Avg.
73°
50°
27
Hist. Avg.
72°
49°
28
Hist. Avg.
72°
49°
29
Hist. Avg.
72°
49°
30
Hist. Avg.
71°
48°
1
Hist. Avg.
71°
48°
2
Hist. Avg.
70°
48°
3
Hist. Avg.
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in West Chester
West Chester's September 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 45° and 59°. The average high for September is 77° with an average low of 53°. 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 West Chester. See also: October | November | December.
