S
M
T
W
T
F
S
26
91°
76°
27
91°
75°
28
91°
77°
29
91°
77°
30
91°
79°
31
91°
77°
1
91°
79°
2
93°
79°
3
91°
79°
4
91°
77°
5
90°
75°
6
91°
79°
7
93°
77°
8
91°
79°
9
97°
79°
10
93°
81°
11
90°
79°
12
91°
79°
13
91°
79°
14
95°
78°
15
97°
75°
16
91°
81°
17
93°
78°
18
93°
75°
19
91°
79°
20
91°
79°
21
90°
72°
22
89°
70°
23
88°
72°
24
88°
73°
25
86°
71°
26
88°
73°
27
87°
76°
28
84°
72°
29
84°
72°
30
85°
71°
31
84°
70°
1
80°
70°
2
81°
70°
3
82°
69°
4
82°
70°
5
81°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Diego
San Diego's August 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 69° and 76°. The average high for August is 85° 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 August weather will actually feel in San Diego. See also: September | October | November.
