S
M
T
W
T
F
S
26
84°
65°
27
83°
67°
28
85°
68°
29
88°
64°
30
82°
66°
31
82°
68°
1
83°
66°
2
84°
68°
3
87°
69°
4
88°
69°
5
88°
67°
6
86°
66°
7
88°
68°
8
89°
67°
9
85°
68°
10
89°
68°
11
87°
67°
12
87°
67°
13
86°
68°
14
88°
67°
15
84°
62°
16
81°
62°
17
80°
66°
18
80°
67°
19
81°
67°
20
83°
66°
21
84°
66°
22
83°
66°
23
83°
65°
24
89°
65°
25
88°
66°
26
88°
65°
27
86°
64°
28
85°
65°
29
80°
64°
30
82°
58°
31
80°
59°
1
78°
63°
2
78°
64°
3
85°
64°
4
86°
63°
5
83°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lake Monticello
Lake Monticello's August 2026 forecast shows daily high temperatures ranging from 78° to 89°, with overnight lows between 58° and 69°. The average high for August is 84° 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 Lake Monticello. See also: September | October | November.
