S
M
T
W
T
F
S
26
88°
77°
27
88°
76°
28
90°
76°
29
89°
76°
30
90°
76°
31
90°
76°
1
88°
76°
2
89°
78°
3
91°
78°
4
89°
76°
5
89°
76°
6
88°
77°
7
90°
76°
8
90°
77°
9
91°
76°
10
90°
77°
11
90°
77°
12
91°
76°
13
89°
76°
14
89°
75°
15
88°
75°
16
89°
76°
17
91°
76°
18
92°
75°
19
91°
77°
20
92°
76°
21
91°
77°
22
91°
77°
23
92°
76°
24
92°
75°
25
91°
77°
26
91°
76°
27
90°
76°
28
92°
77°
29
90°
77°
30
91°
76°
31
92°
77°
1
91°
76°
2
92°
77°
3
92°
76°
4
91°
76°
5
91°
75°
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 88° to 92°, with overnight lows between 75° and 78°. The average high for August is 90° with an average low of 76°. 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.
