S
M
T
W
T
F
S
26
94°
65°
27
94°
66°
28
92°
63°
29
90°
62°
30
92°
61°
31
91°
64°
1
95°
65°
2
92°
65°
3
98°
64°
4
98°
66°
5
97°
66°
6
98°
64°
7
98°
66°
8
97°
65°
9
97°
64°
10
96°
63°
11
97°
63°
12
97°
65°
13
96°
64°
14
97°
64°
15
94°
63°
16
91°
62°
17
91°
62°
18
92°
61°
19
90°
62°
20
90°
65°
21
91°
61°
22
90°
61°
23
91°
62°
24
93°
63°
25
94°
65°
26
96°
63°
27
94°
63°
28
93°
62°
29
94°
61°
30
92°
60°
31
90°
59°
1
91°
60°
2
92°
61°
3
94°
61°
4
94°
62°
5
93°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Riverside
Riverside's August 2026 forecast shows daily high temperatures ranging from 90° to 98°, with overnight lows between 59° and 66°. The average high for August is 94° with an average low of 63°. 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 Riverside. See also: September | October | November.
