S
M
T
W
T
F
S
26
81°
72°
27
80°
69°
28
80°
73°
29
80°
73°
30
80°
72°
1
80°
71°
2
81°
73°
3
81°
73°
4
80°
73°
5
78°
71°
6
80°
67°
7
80°
72°
8
80°
73°
9
79°
72°
10
81°
73°
11
81°
74°
12
81°
74°
13
80°
74°
14
80°
72°
15
81°
71°
16
81°
75°
17
82°
74°
18
81°
76°
19
82°
75°
20
80°
76°
21
80°
74°
22
80°
73°
23
80°
69°
24
80°
69°
25
80°
73°
26
80°
73°
27
80°
73°
28
80°
73°
29
82°
72°
30
81°
74°
31
81°
74°
1
83°
74°
2
84°
72°
3
84°
73°
4
84°
72°
5
85°
71°
6
84°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hawai‘i Kai
Hawai‘i Kai's May 2026 forecast shows daily high temperatures ranging from 80° to 85°, with overnight lows between 71° and 74°. The average high for May is 83° with an average low of 73°. 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 Hawai‘i Kai. See also: June | July | August.
