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°
63°
25
95°
60°
26
97°
61°
27
94°
62°
28
84°
59°
29
86°
55°
30
86°
56°
31
79°
56°
1
79°
55°
2
81°
57°
3
79°
58°
4
86°
57°
5
87°
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 79° to 87°, with overnight lows between 55° and 59°. The average high for August is 83° with an average low of 57°. 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.
