S
M
T
W
T
F
S
26
88°
66°
27
90°
66°
28
88°
63°
29
68°
63°
30
84°
63°
1
84°
64°
2
88°
66°
3
88°
64°
4
84°
66°
5
84°
63°
6
84°
65°
7
79°
73°
8
84°
61°
9
86°
63°
10
86°
64°
11
88°
59°
12
84°
63°
13
84°
63°
14
72°
54°
15
88°
63°
16
88°
64°
17
72°
64°
18
88°
61°
19
68°
59°
20
71°
55°
21
67°
53°
22
64°
55°
23
67°
59°
24
68°
61°
25
71°
63°
26
71°
62°
27
72°
62°
28
72°
58°
29
71°
60°
30
70°
59°
31
69°
58°
1
66°
58°
2
67°
60°
3
66°
58°
4
65°
56°
5
66°
56°
6
68°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Itajaí
Itajaí's May 2026 forecast shows daily high temperatures ranging from 64° to 72°, with overnight lows between 53° and 63°. The average high for May is 68° with an average low of 58°. 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 Itajaí. See also: June | July | August.
