S
M
T
W
T
F
S
26
88°
71°
27
89°
68°
28
89°
68°
29
90°
69°
30
91°
68°
31
87°
71°
1
89°
72°
2
88°
72°
3
90°
73°
4
89°
70°
5
90°
73°
6
89°
72°
7
90°
70°
8
92°
70°
9
93°
71°
10
93°
72°
11
90°
71°
12
91°
72°
13
89°
72°
14
88°
71°
15
88°
72°
16
91°
72°
17
93°
71°
18
93°
72°
19
92°
69°
20
88°
67°
21
88°
67°
22
90°
71°
23
92°
69°
24
88°
70°
25
87°
67°
26
87°
69°
27
92°
71°
28
92°
69°
29
91°
66°
30
85°
67°
31
86°
66°
1
88°
67°
2
88°
70°
3
90°
69°
4
89°
69°
5
85°
68°
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 85° to 93°, with overnight lows between 66° and 73°. The average high for August is 89° with an average low of 70°. 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.
