S
M
T
W
T
F
S
26
87°
69°
27
84°
62°
28
82°
63°
29
84°
68°
30
85°
63°
31
84°
65°
1
86°
68°
2
86°
62°
3
84°
63°
4
82°
61°
5
83°
64°
6
84°
64°
7
85°
62°
8
84°
62°
9
86°
67°
10
89°
67°
11
87°
68°
12
88°
68°
13
89°
67°
14
89°
68°
15
90°
62°
16
89°
61°
17
83°
61°
18
83°
67°
19
85°
61°
20
83°
59°
21
82°
60°
22
83°
60°
23
88°
64°
24
89°
66°
25
88°
65°
26
88°
60°
27
82°
58°
28
81°
59°
29
81°
65°
30
85°
65°
31
85°
64°
1
87°
64°
2
87°
60°
3
83°
64°
4
85°
63°
5
85°
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 81° to 90°, with overnight lows between 58° and 69°. The average high for August is 85° with an average low of 64°. 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.
