S
M
T
W
T
F
S
26
80°
55°
27
81°
56°
28
82°
55°
29
85°
57°
30
86°
58°
31
86°
59°
1
85°
58°
2
86°
60°
3
86°
60°
4
85°
59°
5
85°
59°
6
84°
58°
7
84°
58°
8
83°
57°
9
84°
58°
10
83°
58°
11
81°
57°
12
78°
57°
13
78°
56°
14
83°
51°
15
77°
56°
16
84°
51°
17
79°
53°
18
78°
51°
19
77°
50°
20
77°
50°
21
79°
54°
22
80°
56°
23
84°
56°
24
82°
55°
25
81°
55°
26
83°
53°
27
79°
51°
28
78°
53°
29
79°
50°
30
78°
52°
31
78°
48°
1
77°
52°
2
82°
51°
3
82°
52°
4
81°
47°
5
76°
51°
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 76° to 86°, with overnight lows between 47° and 60°. The average high for August is 81° with an average low of 55°. 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.
