Hilo, Big Island weather in August 2025

Expect 24°C 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.

• 24
  24°C max day temperature
• 5
  5 hours of sunshine per day
• 15
  15 days with some rainfall
• 16
  16°C min night temperature
• 13
  13 hours of daylight per day
• M
  Moderate heat & humidity
• 250
  250 mm of monthly rainfall
• 11
  11+ (Extreme) UV index
• 26
  26°C sea temperature

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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 / mm)  |  Imperial (°F / inches)

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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.

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