S
M
T
W
T
F
S
30
82°
67°
31
81°
69°
1
84°
70°
2
87°
68°
3
87°
65°
4
79°
60°
5
78°
59°
6
79°
59°
7
79°
58°
8
81°
60°
9
81°
62°
10
78°
59°
11
79°
55°
12
74°
55°
13
73°
56°
14
78°
60°
15
73°
59°
16
73°
60°
17
72°
53°
18
71°
50°
19
70°
50°
20
70°
54°
21
75°
57°
22
78°
58°
23
79°
58°
24
78°
57°
25
76°
54°
26
75°
55°
27
76°
56°
28
76°
56°
29
77°
54°
30
70°
51°
1
67°
48°
2
68°
53°
3
73°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Exton
Exton's September 2026 forecast shows daily high temperatures ranging from 67° to 87°, with overnight lows between 48° and 70°. 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 Exton. See also: October | November | December.
