Kailua, Oahu weather in August 2025

Q: 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.

Q: 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.

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

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

Q: 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.

Q: What is the chance of a cyclone 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.

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
31°C max day temperature
10
10 hours of sunshine per day
7
7 days with some rainfall
22
22°C min night temperature
13
13 hours of daylight per day
H
High heat & humidity
38
38 mm of monthly rainfall
11
11+ (Extreme) UV index
26
26°C sea temperature

More about Kailua, Oahu

Kailua, Oahu by month

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

Recommended for Hawaii

Avalon Waterways: Top deals on 2025 river cruises

Sale

Book early & save on 2025 river cruises with Avalon Waterways
Filter deals by promotion, month, destination & more
Travel between 1st Jan & 31st Dec 2025 (inclusive)

Go to Avalon Waterways deal >>

Expires at 23:59 on Wednesday 31st Dec 2025 · View all Avalon Waterways offers

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)

More about the USA

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.

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

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

Be inspired

Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers

We promise not to share your details

Popular travel offers

Hawaii - quick facts
Flight time^✝	18 hours
Time difference	UK -10 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Nature Nightlife
Tourist info	Hawaii Tourism Authority