S
M
T
W
T
F
S
26
77°
50°
27
77°
51°
28
78°
52°
29
79°
52°
30
78°
51°
31
78°
52°
1
82°
52°
2
84°
54°
3
80°
52°
4
78°
51°
5
78°
50°
6
79°
50°
7
78°
53°
8
79°
53°
9
79°
51°
10
84°
51°
11
79°
51°
12
83°
50°
13
84°
49°
14
86°
51°
15
85°
53°
16
86°
53°
17
86°
54°
18
85°
54°
19
87°
53°
20
87°
54°
21
86°
54°
22
87°
53°
23
86°
53°
24
86°
52°
25
85°
52°
26
86°
53°
27
86°
52°
28
85°
52°
29
86°
50°
30
85°
50°
31
84°
47°
1
82°
48°
2
81°
47°
3
80°
46°
4
81°
45°
5
79°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Monte Rio
Monte Rio's August 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 45° and 54°. The average high for August is 82° with an average low of 51°. 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 Monte Rio. See also: September | October | November.
