S
M
T
W
T
F
S
30
86°
71°
31
83°
66°
1
84°
65°
2
82°
62°
3
80°
66°
4
81°
64°
5
85°
71°
6
86°
67°
7
88°
69°
8
88°
70°
9
89°
68°
10
86°
67°
11
83°
66°
12
80°
65°
13
81°
67°
14
83°
66°
15
85°
67°
16
82°
64°
17
85°
67°
18
77°
62°
19
78°
63°
20
82°
65°
21
83°
67°
22
81°
66°
23
80°
67°
24
79°
64°
25
80°
66°
26
84°
67°
27
83°
68°
28
83°
67°
29
82°
66°
30
82°
67°
1
83°
66°
2
82°
66°
3
80°
64°
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 77° to 89°, with overnight lows between 62° and 71°. The average high for September is 83° 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 Los Alamitos. See also: October | November | December.
