S
M
T
W
T
F
S
30
80°
61°
31
81°
59°
1
83°
58°
2
82°
57°
3
80°
56°
4
78°
57°
5
78°
57°
6
79°
58°
7
80°
59°
8
82°
58°
9
80°
56°
10
79°
56°
11
79°
57°
12
80°
59°
13
81°
61°
14
84°
61°
15
85°
62°
16
85°
63°
17
86°
62°
18
86°
62°
19
84°
61°
20
85°
62°
21
84°
59°
22
83°
57°
23
78°
58°
24
80°
59°
25
85°
60°
26
79°
58°
27
Hist. Avg.
80°
57°
28
Hist. Avg.
80°
57°
29
Hist. Avg.
79°
57°
30
Hist. Avg.
79°
57°
1
Hist. Avg.
79°
57°
2
Hist. Avg.
79°
57°
3
Hist. Avg.
79°
57°
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 78° to 86°, with overnight lows between 56° and 63°. The average high for September is 82° 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.
