S
M
T
W
T
F
S
26
95°
75°
27
97°
77°
28
99°
75°
29
100°
77°
30
102°
75°
31
100°
77°
1
99°
75°
2
97°
74°
3
98°
74°
4
97°
72°
5
93°
75°
6
92°
73°
7
97°
75°
8
97°
74°
9
96°
75°
10
96°
75°
11
95°
74°
12
97°
75°
13
97°
75°
14
96°
74°
15
97°
75°
16
96°
75°
17
97°
74°
18
94°
75°
19
96°
73°
20
95°
74°
21
94°
74°
22
95°
73°
23
93°
70°
24
92°
70°
25
89°
71°
26
89°
72°
27
88°
72°
28
87°
71°
29
88°
72°
30
89°
73°
31
87°
72°
1
88°
71°
2
89°
69°
3
89°
70°
4
88°
66°
5
88°
69°
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 87° to 102°, with overnight lows between 66° and 77°. The average high for August is 94° with an average low of 73°. 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.
