S
M
T
W
T
F
S
26
81°
66°
27
81°
69°
28
83°
67°
29
83°
67°
30
85°
69°
31
86°
68°
1
85°
62°
2
84°
61°
3
81°
63°
4
81°
62°
5
79°
62°
6
80°
61°
7
81°
61°
8
82°
64°
9
80°
66°
10
82°
67°
11
81°
67°
12
83°
66°
13
81°
67°
14
85°
65°
15
85°
62°
16
82°
66°
17
82°
61°
18
81°
61°
19
78°
60°
20
79°
59°
21
78°
63°
22
79°
62°
23
78°
61°
24
79°
66°
25
78°
65°
26
83°
66°
27
82°
66°
28
83°
65°
29
83°
66°
30
78°
61°
31
82°
59°
1
77°
58°
2
77°
58°
3
76°
63°
4
76°
59°
5
81°
58°
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 86°, with overnight lows between 58° and 69°. The average high for August is 81° with an average low of 63°. 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.
