Which is the hottest month in Kailua, Oahu?

The hottest time of year in Kailua, Oahu is normally September. Expect maximum daytime temperatures to reach 30°C with high heat and humidity.

Which month has the most rain in Kailua, Oahu?

In terms of rainfall, November is usually the wettest month in Kailua, Oahu with 119mm on average. There are normally 10 days in November with some rain.

When is it sunniest in Kailua, Oahu?

The sunniest time of year in Kailua, Oahu is normally September with bright sunshine on average for 74% of daylight hours; that's 9 hours of sunshine per day.

When is the sea warmest in Kailua, Oahu?

The sea is usually at its warmest in Kailua, Oahu in September when the water temperature reaches 27°C.

Best time to visit Kailua, Oahu

Q: When is the best time to visit Kailua, Oahu?

The best time to visit Kailua, Oahu is May based on the following average weather conditions. Maximum daytime temperature = 22 - 30°C. Daily hours of sunshine = 10 hours or more.

Find the best time to visit Kailua, Oahu and plan your perfect trip in 2025/2026. Get holiday inspiration, weather guides, travel advice and find great deals.

Kailua, Oahu by month

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

Recommended for Hawaii

Avalon Waterways: Current offers on 2025 river cruises

Sale

Save on river cruises in 2025 with Avalon Waterways
Book river cruises in Europe, Asia, Africa & Americas
Filter deals by promotion, month, destination & more

Go to Avalon Waterways deal >>

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

When is the best time to visit Kailua, Oahu?

The best time to visit Kailua, Oahu is May based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

Change the criteria to reflect your weather preferences.

4
Jan
4
Feb
4
Mar
4
Apr
4.5
May
4
Jun
4
Jul
4
Aug
4
Sep
4
Oct
4
Nov
4
Dec

Change criteria

Max Day Temperature (°C)

26
Jan
26
Feb
27
Mar
27
Apr
28
May
29
Jun
30
Jul
31
Aug
30
Sep
29
Oct
28
Nov
27
Dec

Hours of Sunshine (daily)

7
Jan
7
Feb
8
Mar
8
Apr
9
May
9
Jun
10
Jul
10
Aug
9
Sep
8
Oct
7
Nov
6
Dec

Best time to visit

Destination

Daytime temperature

Sunshine hours

Sea temperature

Monthly rainfall

Days with some rain

Heat & humidity

The weather guide for Hawaii (Kailua, Oahu) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)