S
M
T
W
T
F
S
26
85°
59°
27
83°
60°
28
81°
59°
29
81°
59°
30
82°
58°
31
82°
58°
1
83°
59°
2
82°
58°
3
82°
59°
4
83°
59°
5
83°
60°
6
84°
60°
7
87°
59°
8
82°
57°
9
83°
57°
10
90°
62°
11
89°
62°
12
89°
61°
13
88°
58°
14
82°
60°
15
84°
59°
16
87°
61°
17
88°
62°
18
89°
58°
19
88°
55°
20
82°
57°
21
82°
55°
22
83°
56°
23
85°
56°
24
85°
54°
25
83°
54°
26
82°
55°
27
83°
54°
28
84°
53°
29
83°
54°
30
83°
57°
31
84°
59°
1
83°
55°
2
81°
54°
3
80°
52°
4
82°
53°
5
83°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Monticello
Monticello's August 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 52° and 62°. The average high for August is 84° with an average low of 57°. 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 Monticello. See also: September | October | November.
