Hilo, Big Island weather in May 2026

Expect daytime maximum temperatures of 23°C in Hilo, Big Island, Hawaii in May based on long-term weather averages. There are 5 hours of sunshine per day on average with 14 days with some rainfall and typically 206 mm of rainfall in the month.

  • 23°C maximum daytime temperature in May in Hilo, Big Island23
    23°C max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in May in Hilo, Big Island14
    14 days with some rainfall
  • 15°C minimum night-time temperature in May in Hilo, Big Island15
    15°C min night temperature
  • 13 hours of daylight per day in May in Hilo, Big Island13
    13 hours of daylight per day
  • Moderate heat & humidity in May in Hilo, Big IslandM
    Moderate heat & humidity
  • 206 mm monthly rainfall in May in Hilo, Big Island206
    206 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in Hilo, Big Island11
    11+ (Extreme) UV index
  • 25°C sea temperature in May in Hilo, Big Island25
    25°C sea temperature

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Hilo, Big Island by month

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The May weather guide for Hawaii (Hilo, Big Island) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Hilo, Big Island in May?

Daytime temperatures usually reach 28°C in Hilo, Big Island in May with moderate heat and humidity, falling to 20°C at night.

How sunny is it in Hilo, Big Island in May?

There are normally 9 hours of bright sunshine each day in Hilo, Big Island in May - that's 67% of daylight hours.

How warm is the sea around Hilo, Big Island in May?

The average sea temperature around Hilo, Big Island in May is 25°C.

Does it rain in Hilo, Big Island in May?

There are usually 8 days with some rain in Hilo, Big Island in May and the average monthly rainfall is 16mm.

Hilo, Big Island May sunrise & sunset times

Browse the sunrise and sunset times for Hilo, Big Island in May 2026. Select a month to view Hilo, Big Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:51 18:44
Saturday, 16th May 2026 05:44 18:49
Sunday, 31st May 2026 05:41 18:55

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