S
M
T
W
T
F
S
30
81°
68°
31
84°
67°
1
85°
65°
2
80°
60°
3
79°
62°
4
80°
64°
5
80°
63°
6
81°
65°
7
82°
62°
8
80°
62°
9
80°
59°
10
79°
60°
11
80°
61°
12
81°
64°
13
82°
61°
14
83°
60°
15
80°
67°
16
80°
67°
17
78°
66°
18
78°
67°
19
79°
67°
20
78°
66°
21
78°
66°
22
81°
65°
23
81°
67°
24
82°
67°
25
84°
66°
26
84°
65°
27
83°
63°
28
81°
62°
29
81°
64°
30
80°
65°
1
82°
66°
2
84°
65°
3
83°
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 78° to 85°, with overnight lows between 59° and 68°. The average high for September is 81° with an average low of 64°. 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.
