Hilo, Big Island weather in August 2025

Expect 75°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Hilo, Big Island in August. Check more long-term weather averages for Hilo, Big Island in August before you book your next holiday to Hawaii in 2025/2026.

  • 75°F maximum daytime temperature in August in Hilo, Big Island75
    75°F max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in August in Hilo, Big Island15
    15 days with some rainfall
  • 61°F minimum night-time temperature in August in Hilo, Big Island61
    61°F min night temperature
  • 13 hours of daylight per day in August in Hilo, Big Island13
    13 hours of daylight per day
  • Moderate heat & humidity in August in Hilo, Big IslandM
    Moderate heat & humidity
  • 9.8 inches monthly rainfall in August in Hilo, Big Island9.8
    9.8 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Hilo, Big Island11
    11+ (Extreme) UV index
  • 79°F sea temperature in August in Hilo, Big Island79
    79°F sea temperature

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Hilo, Big Island by month

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The August 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)  |  Imperial (°F)

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More about the USA

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

Daytime temperatures usually reach 75°F in Hilo, Big Island in August, falling to 61°F at night.

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

There are normally 5 hours of bright sunshine each day in Hilo, Big Island in August - that's 42% of daylight hours.

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

The average sea temperature around Hilo, Big Island in August is 79°F.

Does it rain in Hilo, Big Island in August?

There are usually 15 days with some rain in Hilo, Big Island in August and the average monthly rainfall is 9.8 inches.

What is the chance of a hurricane in Hilo, Big Island in August?

On average less than 1 day in August in Hilo, Big Island is likely to be affected by the passage of one or more tropical storms.

Hilo, Big Island August sunrise & sunset times

Browse the sunrise and sunset times for Hilo, Big Island in August 2025. 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 August 2025 05:56 18:57
Saturday, 16th August 2025 06:01 18:48
Sunday, 31st August 2025 06:05 18:36

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