S
M
T
W
T
F
S
30
95°
75°
31
91°
77°
1
93°
73°
2
92°
73°
3
94°
73°
4
99°
66°
5
93°
68°
6
N/A
7
87°
68°
8
85°
67°
9
84°
65°
10
84°
64°
11
73°
60°
12
76°
58°
13
78°
58°
14
76°
63°
15
79°
63°
16
78°
62°
17
78°
64°
18
76°
61°
19
75°
62°
20
71°
60°
21
70°
58°
22
72°
57°
23
71°
54°
24
71°
54°
25
72°
56°
26
72°
57°
27
71°
57°
28
72°
55°
29
70°
54°
30
70°
58°
1
69°
58°
2
70°
57°
3
70°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Clemente
San Clemente's September 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 53° and 68°. The average high for September is 75° with an average low of 59°. 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.
