S
M
T
W
T
F
S
30
80°
63°
31
79°
62°
1
79°
62°
2
78°
61°
3
77°
60°
4
78°
60°
5
78°
62°
6
79°
64°
7
79°
62°
8
77°
60°
9
74°
60°
10
75°
61°
11
77°
61°
12
76°
62°
13
77°
60°
14
75°
62°
15
74°
58°
16
76°
56°
17
77°
56°
18
75°
57°
19
73°
58°
20
77°
60°
21
75°
57°
22
75°
55°
23
77°
55°
24
76°
56°
25
74°
57°
26
75°
56°
27
76°
54°
28
75°
52°
29
72°
55°
30
73°
59°
1
77°
59°
2
79°
60°
3
80°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Carlsbad
Carlsbad's September 2026 forecast shows daily high temperatures ranging from 72° to 80°, with overnight lows between 52° and 64°. The average high for September is 76° 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 Carlsbad. See also: October | November | December.
