S
M
T
W
T
F
S
26
83°
67°
27
82°
69°
28
79°
66°
29
81°
68°
30
83°
66°
1
84°
66°
2
83°
68°
3
82°
69°
4
84°
69°
5
84°
68°
6
85°
70°
7
84°
69°
8
79°
67°
9
77°
69°
10
78°
68°
11
78°
69°
12
79°
69°
13
78°
68°
14
78°
69°
15
79°
69°
16
78°
68°
17
77°
66°
18
77°
66°
19
78°
67°
20
77°
67°
21
77°
68°
22
78°
68°
23
77°
68°
24
78°
69°
25
78°
68°
26
79°
69°
27
78°
68°
28
78°
68°
29
79°
69°
30
78°
69°
31
78°
68°
1
79°
68°
2
78°
67°
3
78°
68°
4
79°
68°
5
78°
69°
6
78°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hilo
Hilo's May 2026 forecast shows daily high temperatures ranging from 77° to 85°, with overnight lows between 66° and 70°. The average high for May is 79° with an average low of 68°. 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 Hilo. See also: June | July | August.
