Kailua, Big Island weather in August 2025

Expect 23°C daytime maximum temperatures in the shade in Kailua, Big Island in August based on long-term weather averages. There is usually 17 days with some rainfall and 50 mm of average monthly rainfall in August.

  • 23°C maximum daytime temperature in August in Kailua, Big Island23
    23°C max day temperature
  • 17 days with some rainfall in August in Kailua, Big Island17
    17 days with some rainfall
  • 15°C minimum night-time temperature in August in Kailua, Big Island15
    15°C 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
  • 50 mm monthly rainfall in August in Kailua, Big Island50
    50 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in August in Kailua, Big Island11
    11+ (Extreme) UV index
  • 27°C sea temperature in August in Kailua, Big Island27
    27°C sea temperature

More about Kailua, Big Island

Kailua, Big Island by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Hawaii

Cosmos: Flight-inclusive tours from £999

  • Book tours with flights from just £999 per person
  • Pay low deposits from £150 per person to secure tour
  • Travel before 31st December 2025 (inclusive)
Go to Cosmos deal >>

Expires at 23:59 on Monday 31st Mar 2025 · View all Cosmos offers

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 / mm)  |  Imperial (°F / inches)

Back to top

More about the USA

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

Daytime temperatures usually reach 23°C in Kailua, Big Island in August, falling to 15°C at night.

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

The average sea temperature around Kailua, Big Island in August is 27°C.

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 50mm.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^