S
M
T
W
T
F
S
30
88°
80°
31
94°
79°
1
91°
77°
2
91°
76°
3
90°
76°
4
90°
78°
5
91°
77°
6
92°
77°
7
91°
76°
8
89°
79°
9
89°
80°
10
90°
79°
11
90°
75°
12
91°
76°
13
90°
75°
14
87°
75°
15
87°
74°
16
88°
75°
17
87°
75°
18
87°
74°
19
88°
75°
20
89°
75°
21
87°
74°
22
87°
75°
23
88°
75°
24
88°
74°
25
89°
75°
26
87°
74°
27
88°
75°
28
88°
75°
29
89°
74°
30
88°
75°
1
88°
75°
2
89°
74°
3
87°
74°
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 87° to 92°, with overnight lows between 74° and 80°. The average high for September is 89° 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 San Carlos. See also: October | November | December.
