S
M
T
W
T
F
S
30
83°
64°
31
80°
64°
1
79°
60°
2
77°
58°
3
78°
56°
4
77°
59°
5
85°
56°
6
89°
70°
7
100°
70°
8
95°
71°
9
99°
71°
10
91°
71°
11
84°
67°
12
81°
66°
13
80°
63°
14
78°
66°
15
78°
69°
16
78°
66°
17
79°
60°
18
78°
63°
19
79°
61°
20
80°
60°
21
77°
67°
22
79°
62°
23
78°
58°
24
78°
61°
25
81°
65°
26
82°
66°
27
80°
63°
28
80°
59°
29
79°
57°
30
82°
61°
1
81°
64°
2
83°
62°
3
80°
61°
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 79° to 83°, with overnight lows between 57° and 66°. The average high for September is 81° 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 Carlsbad. See also: October | November | December.
