S
M
T
W
T
F
S
26
100°
71°
27
100°
71°
28
97°
67°
29
97°
65°
30
100°
64°
31
105°
68°
1
107°
70°
2
106°
69°
3
104°
68°
4
101°
67°
5
100°
69°
6
99°
68°
7
97°
67°
8
98°
67°
9
95°
67°
10
93°
69°
11
96°
68°
12
95°
65°
13
95°
66°
14
93°
67°
15
92°
66°
16
94°
66°
17
96°
67°
18
97°
67°
19
97°
66°
20
98°
67°
21
98°
68°
22
97°
67°
23
96°
67°
24
99°
68°
25
99°
67°
26
98°
66°
27
99°
67°
28
99°
67°
29
98°
66°
30
98°
66°
31
97°
65°
1
98°
66°
2
98°
66°
3
92°
63°
4
93°
66°
5
97°
66°
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 92° to 107°, with overnight lows between 63° and 70°. The average high for August is 98° with an average low of 67°. 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.
