S
M
T
W
T
F
S
26
88°
70°
27
90°
73°
28
88°
71°
29
88°
68°
30
76°
65°
1
65°
53°
2
73°
51°
3
78°
47°
4
80°
51°
5
83°
57°
6
86°
65°
7
78°
66°
8
74°
67°
9
76°
67°
10
83°
66°
11
82°
54°
12
81°
55°
13
84°
63°
14
85°
64°
15
87°
71°
16
86°
73°
17
84°
71°
18
83°
70°
19
85°
66°
20
83°
69°
21
86°
70°
22
85°
70°
23
86°
69°
24
87°
70°
25
85°
70°
26
85°
69°
27
84°
70°
28
83°
70°
29
83°
69°
30
85°
70°
31
85°
69°
1
86°
69°
2
85°
71°
3
86°
71°
4
84°
72°
5
83°
72°
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 74° to 87°, with overnight lows between 54° and 73°. The average high for May is 84° with an average low of 68°. 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.
