S
M
T
W
T
F
S
26
76°
48°
27
82°
48°
28
78°
60°
29
74°
54°
30
64°
42°
1
68°
39°
2
72°
37°
3
64°
30°
4
80°
41°
5
74°
54°
6
81°
54°
7
65°
43°
8
73°
36°
9
75°
49°
10
82°
46°
11
71°
48°
12
77°
41°
13
79°
51°
14
65°
43°
15
79°
40°
16
85°
59°
17
89°
54°
18
89°
68°
19
88°
63°
20
78°
62°
21
69°
61°
22
75°
62°
23
79°
62°
24
83°
63°
25
82°
64°
26
84°
61°
27
78°
63°
28
80°
63°
29
77°
59°
30
79°
58°
31
80°
57°
1
82°
62°
2
82°
62°
3
78°
61°
4
76°
57°
5
76°
55°
6
80°
63°
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 69° to 89°, with overnight lows between 55° and 68°. The average high for May is 80° with an average low of 61°. 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.
