S
M
T
W
T
F
S
26
89°
65°
27
88°
68°
28
89°
66°
29
86°
66°
30
87°
65°
31
89°
67°
1
94°
67°
2
90°
67°
3
89°
68°
4
83°
66°
5
83°
64°
6
89°
65°
7
90°
67°
8
92°
66°
9
92°
68°
10
89°
68°
11
87°
65°
12
83°
65°
13
82°
65°
14
82°
61°
15
83°
63°
16
88°
62°
17
87°
61°
18
88°
60°
19
89°
62°
20
85°
61°
21
89°
62°
22
90°
61°
23
91°
63°
24
88°
59°
25
88°
61°
26
90°
62°
27
91°
63°
28
90°
63°
29
89°
62°
30
90°
62°
31
89°
61°
1
89°
61°
2
88°
59°
3
87°
59°
4
87°
60°
5
89°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rancho Santa Margarita
Rancho Santa Margarita's August 2026 forecast shows daily high temperatures ranging from 82° to 91°, with overnight lows between 59° and 65°. The average high for August is 88° with an average low of 62°. 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 Santa Margarita. See also: September | October | November.
