S
M
T
W
T
F
S
26
80°
56°
27
81°
57°
28
81°
61°
29
82°
60°
30
81°
57°
31
82°
62°
1
86°
64°
2
87°
64°
3
88°
63°
4
86°
63°
5
87°
57°
6
80°
56°
7
78°
55°
8
79°
56°
9
80°
56°
10
81°
57°
11
83°
58°
12
84°
61°
13
85°
62°
14
84°
63°
15
85°
63°
16
86°
62°
17
85°
62°
18
79°
57°
19
79°
57°
20
78°
61°
21
79°
62°
22
79°
61°
23
78°
56°
24
78°
55°
25
82°
61°
26
83°
54°
27
78°
56°
28
79°
61°
29
79°
61°
30
84°
60°
31
81°
60°
1
83°
59°
2
81°
59°
3
82°
58°
4
82°
58°
5
75°
52°
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 75° to 88°, with overnight lows between 52° and 64°. The average high for August is 82° with an average low of 59°. 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.
