S
M
T
W
T
F
S
26
85°
67°
27
84°
66°
28
85°
67°
29
85°
66°
30
84°
65°
31
84°
63°
1
82°
61°
2
79°
60°
3
78°
61°
4
79°
63°
5
79°
66°
6
83°
67°
7
85°
67°
8
85°
68°
9
86°
68°
10
86°
67°
11
85°
67°
12
83°
65°
13
85°
66°
14
84°
65°
15
83°
67°
16
84°
67°
17
86°
66°
18
85°
67°
19
86°
66°
20
86°
63°
21
83°
62°
22
81°
61°
23
80°
65°
24
82°
66°
25
85°
65°
26
80°
60°
27
79°
59°
28
79°
60°
29
80°
60°
30
78°
59°
31
81°
61°
1
82°
62°
2
82°
60°
3
81°
61°
4
80°
60°
5
84°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rancho Bernardo
Rancho Bernardo's August 2026 forecast shows daily high temperatures ranging from 78° to 86°, with overnight lows between 59° and 68°. The average high for August is 83° with an average low of 64°. 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 Bernardo. See also: September | October | November.
