S
M
T
W
T
F
S
26
89°
68°
27
89°
68°
28
88°
67°
29
89°
68°
30
89°
68°
31
88°
67°
1
88°
67°
2
89°
68°
3
89°
68°
4
88°
67°
5
88°
68°
6
87°
68°
7
89°
67°
8
89°
68°
9
88°
68°
10
90°
67°
11
89°
65°
12
84°
62°
13
83°
62°
14
85°
64°
15
88°
67°
16
88°
67°
17
88°
62°
18
87°
62°
19
86°
67°
20
87°
68°
21
90°
68°
22
91°
67°
23
90°
65°
24
90°
62°
25
87°
62°
26
86°
61°
27
86°
61°
28
87°
62°
29
86°
61°
30
86°
61°
31
87°
60°
1
85°
59°
2
85°
60°
3
84°
60°
4
84°
61°
5
85°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rancho San Diego
Rancho San Diego's August 2026 forecast shows daily high temperatures ranging from 83° to 91°, with overnight lows between 59° and 68°. The average high for August is 87° 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 August weather will actually feel in Rancho San Diego. See also: September | October | November.
