S
M
T
W
T
F
S
30
86°
71°
31
83°
66°
1
84°
65°
2
82°
62°
3
78°
67°
4
79°
66°
5
80°
70°
6
81°
68°
7
83°
69°
8
87°
68°
9
88°
70°
10
85°
66°
11
83°
65°
12
80°
67°
13
80°
65°
14
82°
66°
15
82°
67°
16
81°
64°
17
84°
67°
18
76°
62°
19
77°
62°
20
81°
64°
21
82°
66°
22
80°
66°
23
79°
67°
24
78°
64°
25
79°
66°
26
83°
67°
27
82°
67°
28
82°
66°
29
81°
66°
30
81°
65°
1
82°
66°
2
81°
66°
3
79°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Seal Beach
Seal Beach's September 2026 forecast shows daily high temperatures ranging from 76° to 88°, with overnight lows between 62° and 70°. The average high for September is 81° 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 Seal Beach. See also: October | November | December.
