S
M
T
W
T
F
S
26
100°
71°
27
99°
70°
28
97°
68°
29
97°
66°
30
98°
65°
31
103°
66°
1
102°
69°
2
104°
70°
3
102°
69°
4
103°
68°
5
100°
68°
6
100°
69°
7
99°
71°
8
100°
71°
9
99°
69°
10
95°
68°
11
94°
68°
12
94°
67°
13
93°
68°
14
92°
67°
15
95°
64°
16
92°
66°
17
91°
64°
18
92°
66°
19
92°
67°
20
93°
66°
21
95°
66°
22
96°
67°
23
96°
68°
24
95°
68°
25
96°
67°
26
95°
67°
27
95°
68°
28
94°
67°
29
94°
68°
30
93°
67°
31
93°
67°
1
94°
66°
2
94°
67°
3
91°
67°
4
88°
66°
5
88°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rialto
Rialto's August 2026 forecast shows daily high temperatures ranging from 88° to 104°, with overnight lows between 64° and 71°. The average high for August is 95° 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 Rialto. See also: September | October | November.
