S
M
T
W
T
F
S
30
79°
66°
31
75°
62°
1
72°
59°
2
71°
56°
3
72°
57°
4
74°
58°
5
80°
56°
6
80°
67°
7
89°
70°
8
95°
71°
9
95°
75°
10
86°
70°
11
79°
67°
12
75°
66°
13
76°
67°
14
75°
66°
15
73°
62°
16
77°
65°
17
76°
62°
18
77°
63°
19
78°
64°
20
74°
66°
21
80°
62°
22
78°
61°
23
80°
64°
24
82°
63°
25
85°
64°
26
81°
60°
27
81°
60°
28
82°
61°
29
79°
58°
30
76°
59°
1
75°
58°
2
78°
59°
3
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in San Clemente
San Clemente's September 2026 forecast shows daily high temperatures ranging from 74° to 85°, with overnight lows between 58° and 66°. The average high for September is 79° with an average low of 62°. 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 San Clemente. See also: October | November | December.
