S
M
T
W
T
F
S
30
95°
72°
31
97°
72°
1
97°
74°
2
94°
73°
3
93°
72°
4
92°
73°
5
92°
73°
6
93°
72°
7
93°
74°
8
94°
74°
9
95°
73°
10
94°
74°
11
94°
74°
12
95°
73°
13
95°
73°
14
94°
71°
15
92°
71°
16
90°
70°
17
90°
71°
18
91°
70°
19
89°
71°
20
91°
72°
21
92°
73°
22
91°
72°
23
93°
67°
24
94°
66°
25
89°
65°
26
92°
68°
27
89°
69°
28
89°
70°
29
Hist. Avg.
90°
67°
30
Hist. Avg.
90°
67°
1
Hist. Avg.
90°
67°
2
Hist. Avg.
90°
66°
3
Hist. Avg.
90°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Diego
San Diego's September 2026 forecast shows daily high temperatures ranging from 89° to 97°, with overnight lows between 65° and 74°. The average high for September is 93° with an average low of 71°. 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 Diego. See also: October | November | December.
