S
M
T
W
T
F
S
30
92°
63°
31
92°
64°
1
94°
63°
2
93°
63°
3
92°
64°
4
97°
64°
5
98°
65°
6
95°
62°
7
90°
61°
8
91°
59°
9
90°
61°
10
92°
64°
11
97°
61°
12
96°
61°
13
96°
64°
14
99°
66°
15
97°
65°
16
95°
61°
17
93°
64°
18
94°
63°
19
96°
61°
20
95°
64°
21
94°
63°
22
91°
63°
23
89°
59°
24
87°
64°
25
90°
61°
26
91°
60°
27
89°
62°
28
89°
63°
29
91°
62°
30
91°
61°
1
86°
61°
2
89°
59°
3
82°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in San Carlos
San Carlos's September 2026 forecast shows daily high temperatures ranging from 82° to 99°, with overnight lows between 57° and 66°. The average high for September is 92° 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 Carlos. See also: October | November | December.
