S
M
T
W
T
F
S
27
86°
66°
28
86°
68°
29
85°
69°
30
84°
69°
1
84°
69°
2
84°
67°
3
84°
66°
4
85°
69°
5
83°
69°
6
84°
67°
7
83°
67°
8
82°
67°
9
84°
67°
10
83°
67°
11
81°
68°
12
83°
66°
13
81°
66°
14
83°
66°
15
80°
65°
16
80°
66°
17
81°
67°
18
82°
67°
19
81°
65°
20
83°
67°
21
83°
67°
22
83°
67°
23
83°
69°
24
82°
67°
25
83°
68°
26
83°
68°
27
83°
66°
28
84°
66°
29
84°
66°
30
83°
68°
31
85°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hilo
Hilo's May 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. 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.
