S
M
T
W
T
F
S
30
75°
64°
31
76°
66°
1
77°
67°
2
78°
65°
3
77°
67°
4
75°
64°
5
80°
69°
6
81°
70°
7
77°
69°
8
76°
70°
9
Hist. Avg.
78°
67°
10
Hist. Avg.
78°
67°
11
Hist. Avg.
78°
67°
12
Hist. Avg.
78°
67°
13
Hist. Avg.
78°
67°
14
Hist. Avg.
78°
66°
15
Hist. Avg.
77°
66°
16
Hist. Avg.
77°
66°
17
Hist. Avg.
77°
66°
18
Hist. Avg.
77°
66°
19
Hist. Avg.
77°
66°
20
Hist. Avg.
77°
66°
21
Hist. Avg.
77°
66°
22
Hist. Avg.
77°
66°
23
Hist. Avg.
77°
66°
24
Hist. Avg.
76°
65°
25
Hist. Avg.
76°
65°
26
Hist. Avg.
76°
65°
27
Hist. Avg.
76°
65°
28
Hist. Avg.
76°
65°
29
Hist. Avg.
76°
65°
30
Hist. Avg.
76°
64°
1
Hist. Avg.
76°
64°
2
Hist. Avg.
76°
64°
3
Hist. Avg.
76°
64°
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 75° to 81°, with overnight lows between 64° and 70°. The average high for September is 77° with an average low of 67°. 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.
