S
M
T
W
T
F
S
30
91°
70°
31
89°
69°
1
90°
69°
2
89°
70°
3
90°
70°
4
90°
67°
5
87°
69°
6
90°
69°
7
89°
68°
8
89°
70°
9
88°
70°
10
89°
69°
11
86°
69°
12
87°
70°
13
87°
69°
14
86°
69°
15
85°
68°
16
87°
68°
17
87°
67°
18
88°
69°
19
89°
66°
20
87°
67°
21
83°
67°
22
85°
63°
23
86°
61°
24
82°
61°
25
82°
64°
26
83°
65°
27
83°
64°
28
82°
60°
29
80°
61°
30
81°
63°
1
82°
64°
2
84°
57°
3
81°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wilmington Beach
Wilmington Beach's September 2026 forecast shows daily high temperatures ranging from 80° to 91°, with overnight lows between 56° and 70°. The average high for September is 86° with an average low of 66°. 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 Wilmington Beach. See also: October | November | December.
