S
M
T
W
T
F
S
26
71°
53°
27
81°
53°
28
76°
59°
29
67°
53°
30
61°
43°
1
62°
40°
2
56°
35°
3
63°
32°
4
78°
51°
5
72°
58°
6
61°
47°
7
63°
41°
8
71°
38°
9
73°
56°
10
77°
55°
11
71°
48°
12
76°
41°
13
75°
51°
14
65°
41°
15
72°
41°
16
82°
61°
17
87°
64°
18
90°
68°
19
88°
67°
20
80°
63°
21
63°
54°
22
74°
58°
23
78°
63°
24
77°
64°
25
75°
65°
26
77°
65°
27
76°
65°
28
81°
59°
29
74°
51°
30
74°
58°
31
72°
57°
1
78°
60°
2
73°
60°
3
76°
60°
4
78°
61°
5
80°
71°
6
77°
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 72° to 81°, with overnight lows between 51° and 71°. The average high for May is 76° 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.
