S
M
T
W
T
F
S
26
90°
72°
27
92°
73°
28
92°
73°
29
91°
72°
30
91°
71°
31
85°
70°
1
89°
72°
2
92°
73°
3
92°
73°
4
91°
72°
5
92°
73°
6
92°
73°
7
87°
68°
8
88°
65°
9
86°
61°
10
84°
63°
11
82°
63°
12
86°
64°
13
81°
65°
14
81°
63°
15
82°
67°
16
86°
66°
17
88°
62°
18
82°
62°
19
81°
61°
20
81°
60°
21
82°
60°
22
85°
65°
23
87°
66°
24
89°
67°
25
89°
67°
26
88°
66°
27
87°
59°
28
85°
60°
29
79°
59°
30
78°
58°
31
79°
57°
1
81°
58°
2
77°
56°
3
77°
55°
4
78°
57°
5
78°
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 77° to 92°, with overnight lows between 55° and 73°. The average high for August is 85° with an average low of 65°. 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.
