S
M
T
W
T
F
S
26
84°
56°
27
83°
56°
28
76°
62°
29
85°
65°
30
75°
63°
1
64°
52°
2
73°
45°
3
74°
40°
4
80°
42°
5
81°
46°
6
86°
65°
7
76°
56°
8
71°
59°
9
74°
64°
10
78°
63°
11
82°
54°
12
79°
53°
13
82°
57°
14
83°
58°
15
82°
61°
16
85°
65°
17
85°
64°
18
84°
66°
19
87°
67°
20
84°
61°
21
81°
65°
22
81°
65°
23
83°
64°
24
81°
65°
25
81°
65°
26
82°
66°
27
82°
66°
28
80°
65°
29
80°
66°
30
81°
66°
31
82°
67°
1
83°
65°
2
83°
67°
3
84°
67°
4
84°
68°
5
85°
68°
6
84°
69°
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 87°, with overnight lows between 53° and 69°. The average high for May is 82° with an average low of 64°. 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.
