S
M
T
W
T
F
S
30
88°
75°
31
90°
74°
1
90°
75°
2
88°
74°
3
87°
74°
4
87°
75°
5
88°
74°
6
87°
74°
7
89°
73°
8
91°
74°
9
89°
74°
10
90°
72°
11
90°
72°
12
89°
73°
13
89°
72°
14
90°
71°
15
88°
71°
16
86°
71°
17
89°
72°
18
Hist. Avg.
87°
70°
19
Hist. Avg.
86°
70°
20
Hist. Avg.
86°
70°
21
Hist. Avg.
86°
70°
22
Hist. Avg.
86°
69°
23
Hist. Avg.
86°
69°
24
Hist. Avg.
85°
69°
25
Hist. Avg.
85°
68°
26
Hist. Avg.
85°
68°
27
Hist. Avg.
85°
68°
28
Hist. Avg.
84°
68°
29
Hist. Avg.
84°
67°
30
Hist. Avg.
84°
67°
1
Hist. Avg.
84°
66°
2
Hist. Avg.
84°
66°
3
Hist. Avg.
83°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Long Beach
Long Beach's September 2026 forecast shows daily high temperatures ranging from 86° to 91°, with overnight lows between 71° and 75°. The average high for September is 89° with an average low of 73°. 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 Long Beach. See also: October | November | December.
