S
M
T
W
T
F
S
30
89°
72°
31
83°
70°
1
82°
66°
2
82°
63°
3
80°
64°
4
80°
63°
5
89°
62°
6
78°
69°
7
92°
74°
8
100°
75°
9
106°
80°
10
94°
79°
11
89°
73°
12
84°
72°
13
85°
71°
14
84°
69°
15
81°
69°
16
80°
68°
17
79°
67°
18
82°
62°
19
85°
65°
20
82°
67°
21
81°
65°
22
84°
64°
23
87°
67°
24
88°
66°
25
89°
67°
26
92°
66°
27
90°
67°
28
89°
65°
29
88°
67°
30
86°
66°
1
85°
62°
2
83°
63°
3
84°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in La Jolla
La Jolla's September 2026 forecast shows daily high temperatures ranging from 81° to 92°, with overnight lows between 62° and 67°. The average high for September is 86° with an average low of 65°. 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 La Jolla. See also: October | November | December.
