S
M
T
W
T
F
S
30
71°
63°
31
73°
64°
1
74°
63°
2
75°
63°
3
74°
64°
4
74°
63°
5
72°
61°
6
Hist. Avg.
76°
64°
7
Hist. Avg.
76°
64°
8
Hist. Avg.
76°
63°
9
Hist. Avg.
76°
63°
10
Hist. Avg.
76°
63°
11
Hist. Avg.
76°
63°
12
Hist. Avg.
76°
63°
13
Hist. Avg.
76°
63°
14
Hist. Avg.
76°
62°
15
Hist. Avg.
76°
62°
16
Hist. Avg.
76°
62°
17
Hist. Avg.
76°
62°
18
Hist. Avg.
76°
62°
19
Hist. Avg.
76°
62°
20
Hist. Avg.
75°
62°
21
Hist. Avg.
75°
61°
22
Hist. Avg.
75°
61°
23
Hist. Avg.
75°
61°
24
Hist. Avg.
75°
61°
25
Hist. Avg.
75°
61°
26
Hist. Avg.
75°
61°
27
Hist. Avg.
74°
60°
28
Hist. Avg.
74°
60°
29
Hist. Avg.
74°
60°
30
Hist. Avg.
74°
60°
1
Hist. Avg.
74°
60°
2
Hist. Avg.
74°
60°
3
Hist. Avg.
73°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in South San Diego
South San Diego's September 2026 forecast shows daily high temperatures ranging from 71° to 75°, with overnight lows between 61° and 64°. The average high for September is 73° with an average low of 63°. 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 South San Diego. See also: October | November | December.
