S
M
T
W
T
F
S
26
85°
73°
27
88°
73°
28
89°
72°
29
87°
72°
30
87°
71°
31
80°
71°
1
83°
72°
2
88°
74°
3
89°
74°
4
89°
73°
5
90°
73°
6
87°
72°
7
84°
71°
8
84°
67°
9
83°
63°
10
79°
64°
11
80°
66°
12
79°
63°
13
79°
64°
14
80°
63°
15
78°
67°
16
80°
68°
17
85°
66°
18
79°
64°
19
79°
63°
20
82°
65°
21
83°
66°
22
82°
67°
23
85°
70°
24
85°
70°
25
86°
69°
26
87°
69°
27
86°
61°
28
83°
61°
29
78°
63°
30
77°
61°
31
78°
60°
1
77°
61°
2
76°
59°
3
76°
58°
4
77°
60°
5
79°
64°
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 90°, with overnight lows between 58° and 74°. The average high for August is 83° with an average low of 67°. 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.
