S
M
T
W
T
F
S
26
66°
47°
27
65°
50°
28
60°
51°
29
61°
39°
30
59°
34°
1
54°
39°
2
54°
38°
3
60°
46°
4
75°
54°
5
59°
41°
6
57°
39°
7
54°
38°
8
61°
42°
9
64°
45°
10
65°
46°
11
67°
45°
12
68°
48°
13
69°
53°
14
71°
51°
15
69°
49°
16
76°
57°
17
75°
55°
18
68°
53°
19
75°
56°
20
73°
55°
21
73°
47°
22
68°
46°
23
67°
47°
24
69°
48°
25
69°
50°
26
68°
49°
27
69°
49°
28
70°
50°
29
71°
53°
30
72°
59°
31
77°
55°
1
72°
52°
2
75°
57°
3
77°
60°
4
78°
60°
5
80°
61°
6
82°
62°
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 54° to 82°, with overnight lows between 38° and 62°. The average high for May is 69° with an average low of 50°. 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.
