The best times to visit Kailua (Oahu) for ideal weather are
January 1st to May 20th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Kailua (Oahu) Travel Guide
Other Kailua (Oahu) Travel Info
Weather in Kailua (Oahu)
Average temperatures in Kailua (Oahu) vary very little. Considering humidity, temperatures feel hot for about half of the year and otherwise nice with a low chance of precipitation most of the year. The area is somewhat temperate — in the 48th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Kailua (Oahu), the hottest months are September, August, and then October. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 85.7°F (29.8°C) with temperatures rarely dropping below 74.8°F (23.8°C) at night.
Kailua (Oahu) Temperatures (Fahrenheit)
Kailua (Oahu) Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Kailua (Oahu) Perceived Temperature (F)
Kailua (Oahu) Perceived Temperature (C)
Average Kailua (Oahu) Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Kailua (Oahu) are September, August, and then June. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid June. For example, on the week of June 11th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early March with an average of 2 days of significant precipitation the week of March 5th.
When can you find snow in Kailua (Oahu)? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Kailua (Oahu).
Snow on the Ground
The graph below shows the average snow on the ground in Kailua (Oahu) (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Kailua (Oahu) has some humid months, and above average humidity throughout the year. The least humid month is April (65.9% relative humidity), and the most humid month is December (69.6%).
Wind in Kailua (Oahu) is usually moderate. The windiest month is June, followed by April and March. June’s average wind speed of around 7.8 knots (9 MPH or 14.5 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early January where average top sustained speeds reach 13.5 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Kailua (Oahu).
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||6.3||Light breeze||12.3||Significant breeze|
|Feb||6.8||Light breeze||12||Significant breeze|
|Mar||7.7||Gentle breeze||12.8||Significant breeze|
|Apr||7.8||Gentle breeze||12.4||Significant breeze|
|May||7||Gentle breeze||11.4||Significant breeze|
|Jun||7.8||Gentle breeze||11.9||Significant breeze|
|Jul||7.5||Gentle breeze||11.6||Significant breeze|
|Aug||7.5||Gentle breeze||11.4||Significant breeze|
|Sep||6.7||Light breeze||10.9||Significant breeze|
|Oct||6.5||Light breeze||10.9||Gentle breeze|
|Nov||7.2||Gentle breeze||12||Significant breeze|
|Dec||6.7||Light breeze||11.9||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Kailua (Oahu)?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Kailua (Oahu), HI, US is July, followed by March and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Kailua (Oahu) in June. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Kailua (Oahu) Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 82.2°F (27.9°C) and 78.5°F (25.8°C) with warmer temperatures in the later months. Rain is somewhat common with 3 to 6 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the least precipitation with about 2 days of precipitation per month. June – August is fairly slow season for tourism in Kailua (Oahu), so lodging and other accommodations may cost slightly less.
Fall (September through November)
Fall daily highs range from 85.7°F (29.8°C) and 80.6°F (27°C), which will feel very nice given the humidity and wind. It rains or snows a normal amount: 2 to 5 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is perfect this time of year in Kailua (Oahu) to be enjoyable for warm weather travelers. The average high during this season is between 80.7°F (27.1°C) and 78.7°F (25.9°C). On average, it rains or snows a fair amount: 3 to 6 times per month. These times of year are the busiest with tourists.