S
M
T
W
T
F
S
26
100°
71°
27
100°
71°
28
97°
67°
29
97°
65°
30
98°
66°
31
104°
66°
1
102°
69°
2
103°
69°
3
99°
67°
4
96°
65°
5
94°
66°
6
99°
67°
7
99°
70°
8
103°
70°
9
100°
70°
10
97°
71°
11
98°
71°
12
92°
68°
13
88°
67°
14
89°
66°
15
91°
64°
16
97°
65°
17
99°
66°
18
100°
68°
19
104°
67°
20
101°
69°
21
103°
74°
22
103°
71°
23
105°
70°
24
105°
72°
25
102°
72°
26
107°
75°
27
101°
79°
28
105°
76°
29
101°
76°
30
96°
71°
31
92°
68°
1
91°
62°
2
88°
60°
3
87°
60°
4
88°
61°
5
94°
59°
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 ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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.
