S
M
T
W
T
F
S
26
55°
41°
27
55°
43°
28
54°
39°
29
54°
34°
30
50°
32°
1
54°
37°
2
66°
37°
3
70°
55°
4
61°
34°
5
49°
33°
6
51°
36°
7
60°
33°
8
61°
39°
9
64°
41°
10
66°
44°
11
67°
45°
12
71°
48°
13
71°
48°
14
70°
46°
15
69°
46°
16
70°
47°
17
72°
50°
18
70°
52°
19
70°
51°
20
68°
49°
21
64°
44°
22
63°
43°
23
64°
44°
24
64°
43°
25
65°
44°
26
64°
45°
27
64°
45°
28
66°
46°
29
67°
55°
30
66°
51°
31
67°
49°
1
73°
55°
2
75°
56°
3
77°
57°
4
78°
58°
5
77°
59°
6
77°
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 49° to 78°, with overnight lows between 33° and 59°. The average high for May is 67° with an average low of 47°. 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.
