S
M
T
W
T
F
S
26
95°
63°
27
97°
63°
28
98°
62°
29
94°
61°
30
96°
62°
31
97°
61°
1
96°
61°
2
94°
61°
3
95°
60°
4
96°
59°
5
95°
58°
6
96°
60°
7
96°
63°
8
98°
64°
9
99°
65°
10
99°
64°
11
98°
62°
12
98°
61°
13
96°
59°
14
96°
57°
15
93°
58°
16
93°
59°
17
94°
60°
18
96°
63°
19
96°
65°
20
99°
65°
21
99°
64°
22
98°
62°
23
99°
63°
24
98°
62°
25
96°
60°
26
93°
57°
27
92°
57°
28
92°
58°
29
93°
58°
30
94°
61°
31
96°
63°
1
97°
63°
2
98°
64°
3
98°
64°
4
97°
63°
5
98°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Simi Valley
Simi Valley's August 2026 forecast shows daily high temperatures ranging from 92° to 99°, with overnight lows between 57° and 65°. The average high for August is 96° with an average low of 61°. 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 Simi Valley. See also: September | October | November.
