S
M
T
W
T
F
S
26
93°
76°
27
95°
77°
28
88°
75°
29
84°
69°
30
83°
62°
31
81°
69°
1
78°
66°
2
84°
63°
3
83°
62°
4
86°
63°
5
75°
67°
6
80°
68°
7
88°
69°
8
82°
63°
9
85°
64°
10
90°
73°
11
89°
74°
12
84°
71°
13
80°
71°
14
83°
73°
15
88°
70°
16
85°
64°
17
79°
62°
18
81°
65°
19
82°
64°
20
83°
65°
21
84°
64°
22
85°
61°
23
79°
61°
24
78°
60°
25
83°
59°
26
85°
64°
27
86°
65°
28
76°
56°
29
79°
60°
30
85°
63°
31
86°
63°
1
86°
64°
2
85°
63°
3
86°
63°
4
84°
62°
5
84°
61°
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 56° and 73°. The average high for August is 83° 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.
