S
M
T
W
T
F
S
26
93°
66°
27
93°
68°
28
86°
68°
29
88°
64°
30
84°
70°
31
70°
63°
1
82°
61°
2
81°
59°
3
82°
66°
4
75°
57°
5
77°
48°
6
77°
54°
7
75°
55°
8
77°
50°
9
82°
64°
10
84°
63°
11
84°
63°
12
85°
64°
13
81°
58°
14
78°
66°
15
77°
60°
16
80°
59°
17
79°
60°
18
83°
61°
19
82°
62°
20
85°
61°
21
82°
60°
22
81°
62°
23
78°
57°
24
78°
63°
25
80°
62°
26
82°
63°
27
82°
62°
28
79°
59°
29
74°
56°
30
72°
54°
31
73°
58°
1
73°
60°
2
75°
61°
3
79°
60°
4
78°
61°
5
77°
60°
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 72° to 85°, with overnight lows between 54° and 66°. The average high for August is 79° with an average low of 61°. 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.
