S
M
T
W
T
F
S
26
87°
66°
27
88°
67°
28
83°
66°
29
86°
66°
30
86°
65°
31
84°
66°
1
81°
66°
2
80°
65°
3
79°
65°
4
80°
64°
5
81°
65°
6
80°
64°
7
80°
63°
8
81°
65°
9
79°
65°
10
78°
64°
11
79°
65°
12
79°
64°
13
80°
61°
14
79°
63°
15
79°
63°
16
78°
61°
17
78°
61°
18
79°
60°
19
78°
60°
20
79°
64°
21
82°
56°
22
79°
55°
23
78°
54°
24
77°
58°
25
78°
61°
26
81°
57°
27
80°
56°
28
77°
62°
29
77°
61°
30
86°
54°
31
77°
53°
1
77°
55°
2
80°
60°
3
76°
53°
4
76°
61°
5
81°
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 76° to 88°, with overnight lows between 53° and 67°. The average high for August is 80° 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 Riverside. See also: September | October | November.
