S
M
T
W
T
F
S
26
93°
60°
27
93°
59°
28
96°
59°
29
96°
63°
30
95°
62°
31
99°
59°
1
102°
61°
2
103°
63°
3
105°
63°
4
99°
63°
5
96°
59°
6
97°
60°
7
97°
60°
8
96°
59°
9
101°
62°
10
91°
61°
11
91°
61°
12
89°
59°
13
79°
59°
14
79°
60°
15
86°
59°
16
93°
57°
17
91°
62°
18
95°
57°
19
96°
60°
20
91°
58°
21
92°
59°
22
94°
60°
23
98°
59°
24
94°
60°
25
95°
62°
26
98°
63°
27
97°
64°
28
92°
58°
29
87°
58°
30
87°
56°
31
91°
58°
1
92°
58°
2
92°
59°
3
94°
61°
4
94°
60°
5
95°
59°
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 87° to 98°, with overnight lows between 56° and 64°. The average high for August is 93° with an average low of 60°. 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.
