S
M
T
W
T
F
S
26
73°
46°
27
73°
50°
28
61°
46°
29
59°
39°
30
54°
36°
1
54°
32°
2
61°
30°
3
77°
45°
4
82°
41°
5
61°
39°
6
54°
32°
7
66°
30°
8
73°
36°
9
73°
45°
10
70°
36°
11
66°
34°
12
79°
46°
13
70°
43°
14
75°
37°
15
84°
55°
16
84°
61°
17
82°
64°
18
77°
63°
19
66°
50°
20
64°
45°
21
63°
48°
22
64°
52°
23
75°
57°
24
82°
50°
25
88°
55°
26
90°
54°
27
90°
55°
28
86°
63°
29
84°
61°
30
82°
57°
31
78°
60°
1
84°
57°
2
86°
57°
3
83°
60°
4
82°
62°
5
81°
61°
6
80°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Monticello
Monticello's May 2026 forecast shows daily high temperatures ranging from 78° to 86°, with overnight lows between 57° and 62°. The average high for May is 82° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Monticello. See also: June | July | August.
