S
M
T
W
T
F
S
30
81°
74°
31
88°
75°
1
87°
77°
2
86°
78°
3
87°
76°
4
80°
76°
5
81°
76°
6
84°
75°
7
82°
75°
8
82°
74°
9
81°
72°
10
85°
71°
11
87°
72°
12
87°
73°
13
93°
73°
14
91°
74°
15
90°
72°
16
90°
80°
17
90°
80°
18
83°
75°
19
84°
76°
20
84°
75°
21
83°
76°
22
87°
77°
23
88°
76°
24
87°
77°
25
86°
77°
26
88°
76°
27
88°
77°
28
89°
77°
29
88°
76°
30
88°
77°
1
85°
77°
2
84°
76°
3
86°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Santa Monica
Santa Monica's September 2026 forecast shows daily high temperatures ranging from 81° to 93°, with overnight lows between 71° and 80°. The average high for September is 87° with an average low of 76°. 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 Santa Monica. See also: October | November | December.
