S
M
T
W
T
F
S
30
82°
59°
31
79°
69°
1
88°
69°
2
77°
69°
3
87°
69°
4
85°
62°
5
79°
59°
6
77°
59°
7
78°
60°
8
75°
58°
9
74°
59°
10
78°
61°
11
78°
60°
12
77°
57°
13
78°
56°
14
77°
57°
15
74°
60°
16
73°
61°
17
73°
54°
18
71°
51°
19
71°
51°
20
72°
55°
21
75°
58°
22
78°
59°
23
79°
59°
24
79°
57°
25
77°
54°
26
76°
56°
27
77°
57°
28
76°
56°
29
77°
55°
30
71°
51°
1
67°
49°
2
69°
54°
3
74°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Coatesville
Coatesville's September 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 49° and 69°. The average high for September is 76° with an average low of 58°. 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 Coatesville. See also: October | November | December.
