S
M
T
W
T
F
S
30
86°
71°
31
83°
66°
1
84°
65°
2
82°
62°
3
80°
64°
4
80°
64°
5
89°
61°
6
79°
67°
7
91°
73°
8
98°
71°
9
109°
74°
10
91°
75°
11
86°
72°
12
83°
71°
13
82°
70°
14
82°
68°
15
80°
70°
16
80°
69°
17
81°
66°
18
80°
63°
19
81°
63°
20
82°
67°
21
80°
66°
22
81°
65°
23
82°
63°
24
80°
67°
25
84°
65°
26
91°
64°
27
89°
69°
28
84°
65°
29
82°
62°
30
81°
65°
1
79°
66°
2
89°
72°
3
96°
74°
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 79° to 96°, with overnight lows between 66° and 74°. The average high for September is 88° with an average low of 71°. 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.
