S
M
T
W
T
F
S
30
82°
59°
31
79°
69°
1
88°
68°
2
73°
68°
3
85°
68°
4
84°
70°
5
79°
65°
6
77°
61°
7
77°
58°
8
81°
54°
9
84°
62°
10
N/A
11
79°
60°
12
79°
69°
13
80°
65°
14
77°
55°
15
78°
58°
16
84°
62°
17
83°
60°
18
81°
54°
19
73°
51°
20
73°
57°
21
74°
52°
22
72°
53°
23
71°
52°
24
72°
56°
25
68°
47°
26
67°
51°
27
75°
55°
28
76°
54°
29
71°
50°
30
73°
55°
1
73°
53°
2
70°
50°
3
71°
53°
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 67° to 84°, with overnight lows between 47° and 69°. The average high for September is 75° with an average low of 55°. 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.
