S
M
T
W
T
F
S
26
85°
70°
27
88°
74°
28
85°
71°
29
73°
60°
30
64°
58°
1
63°
53°
2
76°
49°
3
82°
49°
4
81°
55°
5
87°
68°
6
68°
54°
7
71°
53°
8
77°
65°
9
83°
65°
10
82°
60°
11
77°
51°
12
80°
56°
13
83°
60°
14
88°
67°
15
86°
66°
16
83°
66°
17
82°
65°
18
82°
67°
19
85°
66°
20
86°
69°
21
82°
65°
22
83°
66°
23
81°
66°
24
80°
65°
25
79°
67°
26
80°
67°
27
80°
66°
28
79°
67°
29
81°
67°
30
82°
66°
31
82°
65°
1
83°
65°
2
85°
67°
3
85°
68°
4
83°
69°
5
84°
69°
6
87°
70°
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 71° to 88°, with overnight lows between 51° and 70°. The average high for May is 82° with an average low of 65°. 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.
