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°
67°
5
86°
68°
6
74°
53°
7
70°
52°
8
76°
59°
9
82°
59°
10
89°
62°
11
74°
53°
12
81°
59°
13
86°
64°
14
85°
62°
15
85°
64°
16
87°
65°
17
84°
63°
18
78°
64°
19
79°
65°
20
83°
65°
21
83°
59°
22
79°
58°
23
78°
59°
24
80°
63°
25
78°
60°
26
79°
59°
27
80°
60°
28
81°
60°
29
78°
66°
30
79°
67°
31
81°
68°
1
82°
67°
2
83°
66°
3
85°
68°
4
85°
69°
5
83°
69°
6
82°
68°
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 89°, with overnight lows between 52° and 69°. The average high for May is 81° with an average low of 63°. 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.
