Kailua, Oahu weather in August 2025

Expect 31°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Kailua, Oahu in August. Check more long-term weather averages for Kailua, Oahu in August before you book your next holiday to Hawaii in 2025/2026.

  • 31°C maximum daytime temperature in August in Kailua, Oahu31
    31°C max day temperature
  • 10 hours of sunshine per day
  • 7 days with some rainfall in August in Kailua, Oahu7
    7 days with some rainfall
  • 22°C minimum night-time temperature in August in Kailua, Oahu22
    22°C min night temperature
  • 13 hours of daylight per day in August in Kailua, Oahu13
    13 hours of daylight per day
  • High heat & humidity in August in Kailua, OahuH
    High heat & humidity
  • 38 mm monthly rainfall in August in Kailua, Oahu38
    38 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Kailua, Oahu11
    11+ (Extreme) UV index
  • 26°C sea temperature in August in Kailua, Oahu26
    26°C sea temperature

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The August weather guide for Hawaii (Kailua, Oahu) 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 Kailua, Oahu in August?

Daytime temperatures usually reach 31°C in Kailua, Oahu in August with high heat and humidity, falling to 22°C at night.

How sunny is it in Kailua, Oahu in August?

There are normally 10 hours of bright sunshine each day in Kailua, Oahu in August - that's 74% of daylight hours.

How warm is the sea around Kailua, Oahu in August?

The average sea temperature around Kailua, Oahu in August is 26°C.

Does it rain in Kailua, Oahu in August?

There are usually 7 days with some rain in Kailua, Oahu in August and the average monthly rainfall is 38mm.

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

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

Kailua, Oahu August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 06:05 19:10
Saturday, 16th August 2025 06:10 19:00
Sunday, 31st August 2025 06:14 18:48

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