S
M
T
W
T
F
S
26
63°
42°
27
62°
43°
28
66°
49°
29
70°
52°
30
69°
51°
1
72°
50°
2
64°
45°
3
63°
46°
4
63°
43°
5
65°
52°
6
73°
53°
7
74°
54°
8
74°
51°
9
65°
49°
10
65°
51°
11
66°
51°
12
71°
54°
13
72°
55°
14
76°
56°
15
77°
57°
16
77°
56°
17
75°
55°
18
69°
50°
19
69°
48°
20
71°
56°
21
72°
58°
22
73°
51°
23
73°
51°
24
74°
52°
25
75°
51°
26
75°
51°
27
74°
53°
28
76°
57°
29
80°
57°
30
82°
52°
31
77°
53°
1
76°
55°
2
80°
55°
3
82°
61°
4
83°
61°
5
84°
62°
6
84°
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 62° to 84°, with overnight lows between 42° and 62°. The average high for May is 73° with an average low of 53°. 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.
