S
M
T
W
T
F
S
26
84°
68°
27
87°
69°
28
88°
69°
29
83°
68°
30
84°
69°
31
88°
69°
1
88°
68°
2
89°
69°
3
89°
70°
4
90°
69°
5
89°
69°
6
88°
68°
7
88°
69°
8
87°
69°
9
84°
65°
10
82°
63°
11
82°
63°
12
86°
69°
13
87°
69°
14
86°
68°
15
87°
68°
16
87°
67°
17
88°
67°
18
88°
65°
19
87°
65°
20
88°
67°
21
89°
68°
22
88°
67°
23
87°
67°
24
85°
66°
25
83°
62°
26
82°
61°
27
82°
64°
28
81°
64°
29
80°
62°
30
80°
60°
31
81°
60°
1
83°
62°
2
86°
65°
3
84°
65°
4
85°
61°
5
82°
59°
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 59° and 70°. The average high for August is 86° with an average low of 66°. 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.
