Kailua, Big Island weather in August 2025

Expect 73°F daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in Kailua, Big Island in August. Check more long-term weather averages for Kailua, Big Island in August before you book your next holiday to Hawaii in 2025/2026.

  • 73°F maximum daytime temperature in August in Kailua, Big Island73
    73°F max day temperature
  • 17 days with some rainfall in August in Kailua, Big Island17
    17 days with some rainfall
  • 59°F minimum night-time temperature in August in Kailua, Big Island59
    59°F min night temperature
  • 13 hours of daylight per day in August in Kailua, Big Island13
    13 hours of daylight per day
  • Moderate heat & humidity in August in Kailua, Big IslandM
    Moderate heat & humidity
  • 2.0 inches monthly rainfall in August in Kailua, Big Island2.0
    2.0 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Kailua, Big Island11
    11+ (Extreme) UV index
  • 81°F sea temperature in August in Kailua, Big Island81
    81°F sea temperature

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Kailua, Big Island by month

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The August weather guide for Hawaii (Kailua, 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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How hot is it in Kailua, Big Island in August?

Daytime temperatures usually reach 73°F in Kailua, Big Island in August, falling to 59°F at night.

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

The average sea temperature around Kailua, Big Island in August is 81°F.

Does it rain in Kailua, Big Island in August?

There are usually 17 days with some rain in Kailua, Big Island in August and the average monthly rainfall is 2.0 inches.

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

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

Kailua, Big Island August sunrise & sunset times

Browse the sunrise and sunset times for Kailua, Big Island in August 2025. Select a month to view Kailua, Big Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 06:00 19:00
Saturday, 16th August 2025 06:05 18:51
Sunday, 31st August 2025 06:09 18:39

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