S
M
T
W
T
F
S
26
86°
63°
27
81°
63°
28
82°
54°
29
90°
63°
30
86°
70°
1
73°
59°
2
68°
54°
3
73°
45°
4
81°
46°
5
82°
52°
6
88°
61°
7
77°
70°
8
77°
63°
9
68°
63°
10
84°
64°
11
86°
64°
12
72°
61°
13
79°
61°
14
81°
59°
15
81°
50°
16
88°
61°
17
90°
68°
18
88°
68°
19
90°
68°
20
90°
68°
21
91°
68°
22
88°
68°
23
88°
70°
24
91°
70°
25
82°
70°
26
86°
71°
27
87°
70°
28
85°
69°
29
85°
70°
30
81°
69°
31
81°
67°
1
82°
66°
2
84°
63°
3
85°
68°
4
84°
67°
5
83°
69°
6
86°
67°
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 81° to 91°, with overnight lows between 63° and 71°. 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.
