S
M
T
W
T
F
S
26
83°
63°
27
89°
58°
28
82°
56°
29
83°
58°
30
85°
61°
31
84°
60°
1
86°
61°
2
87°
61°
3
84°
59°
4
83°
56°
5
82°
57°
6
82°
57°
7
80°
55°
8
81°
56°
9
82°
59°
10
87°
59°
11
84°
63°
12
85°
63°
13
85°
59°
14
87°
57°
15
87°
60°
16
84°
55°
17
79°
54°
18
81°
56°
19
81°
57°
20
82°
57°
21
82°
58°
22
81°
57°
23
80°
58°
24
82°
60°
25
84°
61°
26
84°
56°
27
80°
55°
28
79°
57°
29
79°
55°
30
80°
59°
31
85°
55°
1
85°
56°
2
84°
56°
3
84°
57°
4
85°
54°
5
78°
58°
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 78° to 89°, with overnight lows between 54° and 63°. The average high for August is 83° with an average low of 58°. 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.
