S
M
T
W
T
F
S
26
69°
42°
27
70°
51°
28
62°
47°
29
55°
42°
30
53°
38°
1
51°
35°
2
58°
34°
3
71°
46°
4
80°
46°
5
56°
42°
6
53°
38°
7
62°
33°
8
69°
41°
9
69°
49°
10
64°
41°
11
63°
36°
12
76°
41°
13
63°
41°
14
71°
52°
15
79°
60°
16
80°
59°
17
78°
63°
18
79°
59°
19
66°
47°
20
63°
49°
21
65°
47°
22
68°
52°
23
70°
50°
24
72°
53°
25
73°
57°
26
74°
51°
27
69°
57°
28
72°
56°
29
69°
53°
30
68°
52°
31
70°
52°
1
70°
49°
2
71°
49°
3
70°
54°
4
72°
60°
5
81°
61°
6
81°
61°
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 63° to 81°, with overnight lows between 41° and 63°. 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.
