S
M
T
W
T
F
S
26
73°
56°
27
73°
51°
28
66°
52°
29
79°
57°
30
75°
51°
1
68°
50°
2
64°
49°
3
69°
38°
4
78°
40°
5
80°
52°
6
73°
60°
7
77°
49°
8
70°
43°
9
75°
48°
10
83°
52°
11
65°
49°
12
73°
41°
13
79°
43°
14
71°
46°
15
77°
38°
16
85°
47°
17
90°
60°
18
91°
65°
19
92°
66°
20
93°
63°
21
91°
67°
22
68°
57°
23
59°
56°
24
74°
56°
25
85°
66°
26
82°
66°
27
86°
65°
28
84°
61°
29
80°
64°
30
79°
55°
31
70°
58°
1
82°
57°
2
81°
54°
3
77°
59°
4
80°
62°
5
81°
62°
6
79°
63°
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 70° to 86°, with overnight lows between 54° and 65°. The average high for May is 80° with an average low of 60°. 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.
