The temperatures in Hilo in May are comfortable with low of 18°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Hilo during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Hilo in May 2025.
If you’re planning to visit Hilo in the near future, we highly recommend that you review the 14 day weather forecast for Hilo before you arrive.
Temperatures
22° / 18°
Rainy Days
3
Snowy Days
0
Dry Days
28
Rainfall
99
mm
Sun Hours
10.6
Hrs
