S
M
T
W
T
F
S
26
88°
73°
27
88°
73°
28
89°
72°
29
88°
73°
30
87°
73°
31
87°
72°
1
88°
71°
2
90°
73°
3
88°
74°
4
88°
73°
5
89°
73°
6
88°
72°
7
90°
74°
8
89°
74°
9
89°
72°
10
92°
72°
11
91°
72°
12
92°
71°
13
89°
72°
14
90°
71°
15
91°
72°
16
92°
71°
17
92°
72°
18
91°
72°
19
92°
69°
20
91°
69°
21
88°
68°
22
87°
69°
23
87°
68°
24
88°
68°
25
87°
69°
26
88°
67°
27
88°
68°
28
89°
68°
29
89°
69°
30
91°
68°
31
88°
68°
1
89°
71°
2
91°
69°
3
89°
68°
4
87°
69°
5
87°
68°
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 87° to 92°, with overnight lows between 67° and 74°. The average high for August is 89° with an average low of 71°. 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.
