S
M
T
W
T
F
S
26
86°
62°
27
90°
68°
28
85°
68°
29
81°
69°
30
77°
66°
31
88°
65°
1
90°
68°
2
88°
75°
3
86°
69°
4
85°
64°
5
87°
67°
6
95°
76°
7
94°
73°
8
92°
71°
9
90°
73°
10
89°
70°
11
87°
72°
12
86°
71°
13
86°
72°
14
91°
68°
15
84°
66°
16
82°
67°
17
83°
71°
18
87°
67°
19
89°
68°
20
83°
65°
21
80°
66°
22
78°
63°
23
79°
62°
24
82°
60°
25
83°
62°
26
81°
64°
27
82°
63°
28
80°
60°
29
77°
63°
30
78°
62°
31
76°
58°
1
76°
58°
2
77°
59°
3
76°
63°
4
76°
62°
5
78°
60°
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 89°, with overnight lows between 58° and 71°. The average high for August is 80° 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.
