S
M
T
W
T
F
S
30
82°
66°
31
84°
70°
1
87°
70°
2
87°
69°
3
88°
63°
4
86°
60°
5
80°
61°
6
80°
66°
7
81°
65°
8
84°
66°
9
85°
67°
10
80°
66°
11
84°
65°
12
84°
66°
13
83°
66°
14
83°
65°
15
85°
66°
16
85°
64°
17
83°
65°
18
82°
59°
19
82°
57°
20
77°
55°
21
74°
54°
22
74°
62°
23
75°
58°
24
79°
54°
25
73°
54°
26
72°
55°
27
74°
54°
28
78°
59°
29
77°
58°
30
78°
58°
1
72°
59°
2
71°
52°
3
70°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Claymont
Claymont's September 2026 forecast shows daily high temperatures ranging from 70° to 88°, with overnight lows between 52° and 70°. The average high for September is 80° with an average low of 61°. 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 Claymont. See also: October | November | December.
