S
M
T
W
T
F
S
30
86°
66°
31
83°
68°
1
86°
68°
2
86°
67°
3
85°
66°
4
84°
62°
5
82°
63°
6
80°
62°
7
79°
60°
8
78°
61°
9
78°
62°
10
80°
63°
11
80°
64°
12
82°
64°
13
84°
65°
14
84°
62°
15
81°
61°
16
79°
65°
17
79°
66°
18
83°
67°
19
82°
66°
20
84°
66°
21
85°
65°
22
80°
65°
23
79°
61°
24
77°
60°
25
78°
59°
26
76°
60°
27
76°
62°
28
79°
61°
29
77°
61°
30
83°
63°
1
83°
63°
2
Hist. Avg.
79°
61°
3
Hist. Avg.
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Los Alamitos
Los Alamitos's September 2026 forecast shows daily high temperatures ranging from 76° to 86°, with overnight lows between 59° and 68°. The average high for September is 81° with an average low of 63°. 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 Los Alamitos. See also: October | November | December.
