S
M
T
W
T
F
S
26
77°
48°
27
75°
55°
28
63°
50°
29
57°
41°
30
61°
36°
1
59°
36°
2
59°
41°
3
72°
45°
4
79°
50°
5
58°
42°
6
61°
42°
7
67°
50°
8
70°
50°
9
83°
52°
10
67°
43°
11
69°
48°
12
70°
54°
13
74°
53°
14
75°
56°
15
78°
56°
16
76°
54°
17
71°
54°
18
75°
53°
19
76°
56°
20
72°
56°
21
72°
50°
22
68°
49°
23
69°
50°
24
69°
51°
25
70°
51°
26
69°
52°
27
70°
52°
28
71°
57°
29
72°
59°
30
76°
62°
31
73°
59°
1
73°
55°
2
76°
58°
3
76°
62°
4
79°
63°
5
80°
64°
6
77°
65°
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 58° to 83°, with overnight lows between 42° and 65°. The average high for May is 72° with an average low of 54°. 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.
