S
M
T
W
T
F
S
26
83°
65°
27
84°
72°
28
82°
67°
29
70°
61°
30
68°
57°
1
66°
54°
2
73°
47°
3
79°
46°
4
79°
59°
5
77°
64°
6
75°
52°
7
70°
51°
8
75°
48°
9
80°
60°
10
79°
61°
11
77°
54°
12
81°
48°
13
86°
51°
14
82°
57°
15
91°
62°
16
87°
70°
17
88°
65°
18
90°
75°
19
90°
68°
20
82°
68°
21
74°
67°
22
82°
67°
23
82°
65°
24
77°
67°
25
75°
66°
26
81°
69°
27
84°
68°
28
82°
70°
29
85°
69°
30
84°
67°
31
81°
65°
1
84°
64°
2
84°
63°
3
85°
64°
4
85°
65°
5
88°
68°
6
86°
71°
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 75° to 88°, with overnight lows between 63° and 71°. The average high for May is 83° with an average low of 67°. 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.
