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Contents
- The climate of Kailua
- The best time to visit Kailua
- The worst time to visit Kailua
- Spring weather in Kailua
- Summer weather in Kailua
- Autumn weather in Kailua
- Winter weather in Kailua
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Kailua
Located in the island paradise of Hawaii, Kailua is graced with a tropical wet and dry climate, also known as savanna according to the Köppen climate classification. With uniquely few extremes, Kailua always has something pleasant to offer weather-wise.
Throughout the year, the temperature in Kailua varies from 70.5°F (21.4°C) to 80.6°F (27°C). A consistent pattern of relative humidity spanning between 74% and 76% offers a refreshing balance, not too dry, nor too humid. On average, this locale sees monthly rainfall ranging from 0.55" (14mm) to 1.69" (43mm), giving a typically wet period from February to April, but still seldom crossing the threshold of heavy downpours.
Days filled with sunshine and clear blue skies are to be expected, given its 8.3 hours to 13.4 hours daily daylight duration and 30% to 36% cloud coverage. The UV index reaches up to 7 during the year, dictating the need for sun protection throughout. Persistent easterly winds are a norm here, blowing at a gentle average of 10.7mph (17.2km/h) to 14.1mph (22.7km/h). No particular weather anomalies distinguish Kailua. Still, the blend of abundant sunlight, comfortable temperatures, and occasional rain showers make it an idyllic paradise.
Throughout the year, the temperature in Kailua varies from 70.5°F (21.4°C) to 80.6°F (27°C). A consistent pattern of relative humidity spanning between 74% and 76% offers a refreshing balance, not too dry, nor too humid. On average, this locale sees monthly rainfall ranging from 0.55" (14mm) to 1.69" (43mm), giving a typically wet period from February to April, but still seldom crossing the threshold of heavy downpours.
Days filled with sunshine and clear blue skies are to be expected, given its 8.3 hours to 13.4 hours daily daylight duration and 30% to 36% cloud coverage. The UV index reaches up to 7 during the year, dictating the need for sun protection throughout. Persistent easterly winds are a norm here, blowing at a gentle average of 10.7mph (17.2km/h) to 14.1mph (22.7km/h). No particular weather anomalies distinguish Kailua. Still, the blend of abundant sunlight, comfortable temperatures, and occasional rain showers make it an idyllic paradise.
The best time to visit Kailua
This tropical haven of Kailua might seem alluring throughout the year, but some periods still stand out more than others. Between May and October, travelers can expect extraordinarily inviting conditions. Temperatures tend to be the warmest, averaging from 77.7°F (25.4°C) to 80.6°F (27°C), with sea temperatures ranging from 78°F (25.6°C) to 80.4°F (26.9°C), perfect for beach activities. The amount of daily sunshine reaches up to 11.2 hours during these months, guaranteeing ample time to bask in the sun.
The worst time to visit Kailua
Although Kailua still maintains its charm, the stretch from November to March might pose more inconveniences for tourists. These months experience less sunshine, bottoming at 6.6 hours a day in November and December. Temperatures also dip slightly but not freezing, ranging from 74.5°F (23.6°C) to 78.1°F (25.6°C). Additionally, March has the highest average rainfall of 1.69" (43mm). Despite these conditions, Kailua still remains a pleasantly warm destination compared to other regions during this period.
Spring weather in Kailua
From March to May, Kailua enters the mild period known as spring. Temperatures rise steadily from an average low of 71.1°F (21.7°C) in March up to 74.1°F (23.4°C) in May. Corresponding high day temperatures shift from 74.7°F (23.7°C) to 77.7°F (25.4°C). However, rainfall registers on the higher end during the spring, peaking at 1.69" (43mm) in March before descending to 0.98" (25mm) by May. The daylight here gradually grows longer, allowing for more exploration time, with approximately 12 hours to 13.2 hours of daylight each day.
Summer weather in Kailua
Summer in Kailua, from June to August, provides visitors with the most inviting climate. Peak daytime temperatures climb up to an average of 80.2°F (26.8°C), while nighttime lows do not drop below 75.4°F (24.1°C). Rainfall decreases significantly to between 0.55" (14mm) and 0.79" (20mm) across these months, paving the way for sunnier days. Sea temperatures soar to a delightful range from 78.6°F (25.9°C) to 79.5°F (26.4°C), ideal for water sports and beach relaxing. The longest days occur in this period, reaching up to 13.4 hours of daylight in June.
Autumn weather in Kailua
In autumn, Kailua maintains its warm tropical allure from September to November. Temperatures remain comfortably high, hovering between 77°F (25°C) and 80.4°F (26.9°C) during the days and slightly dropping to a range from 75.4°F (24.1°C) to 77°F (25°C) at night. The clear skies start giving way to more clouds and rainfall, starting from 0.94" (24mm) in September up to 0.94" (24mm) in November. The earlier sunset also shortens the daylight, transitioning from an average of 12.3 hours in September to 11.1 hours in November.
Winter weather in Kailua
Despite being winter, the season from December to February in Kailua is far from frigid. Days are mild, with temperatures sitting between 74.5°F (23.6°C) and 76.1°F (24.5°C), while nights stay above 70.5°F (21.4°C). Rainfall increases slightly, ranging from 1.14" (29mm) in December to 1.34" (34mm) in February, but not enough to turn the skies gloomy. The daylight slightly shortens ranging from 10.8 hours to 11.5 hours during the winter months. Sea temperatures also descend slightly but still remain inviting for swimming at around 75.7°F (24.3°C) to 76.6°F (24.8°C). Overall, it’s a mild winter with a tropical twist.
Weather in January
As the year begins in Kailua, Hawaii, weather changes take a backseat, maintaining a tropical consistency instead. The temperature varies minimally from December. The relative humidity remains at 74%, keeping the island's lush vegetation thriving. Weather in January »
Weather in February
February brings subtle shifts in Kailua's weather landscape. The temperature decreases slightly to a low of 70.5°F (21.4°C), fostering a slightly cooler ambiance than January. The possibility of rain increases with 14.7 rainfall days recorded in this month. Weather in February »
Weather in March
March's weather in Kailua remains steady, closely reflecting February in its climatic patterns. There is a slight increase in temperature, relieving the cooled island ambiance from last month. Highly noticeable is the increase in rainfall to 1.69" (43mm). Weather in March »
Weather in April
Kailua's April weather signals signs of the impending summer. The temperature swells marginally from its March levels. The rainfall dips to 0.98" (25mm), giving way to drier conditions with fewer rainfall days. The month's weather holds steady, creating an inviting atmosphere for travelers with its temperature flirtations on either side of 75°F (23.9°C). Weather in April »
Weather in May
May paves the way to summer with a palpable rise in Kailua's weather temperature to a high of 77.7°F (25.4°C). This is coupled with a stable relative humidity percentage of 75, maintaining the tropical feel. Despite a decrease in average rainfall to 0.98" (25mm), the number of daylight hours increases to a delightful 13.2. Weather in May »
Weather in June
June starts the summer season in Kailua with a noticeable increase in temperature, ruling the weather dynamics for this month. Winds escalate, hitting top speeds of 13.8mph (22.2km/h) on average, while gusts surge to 18.5mph (29.8km/h). Weather in June »
Weather in July
July's weather in Kailua brings the highest recorded temperature extending to a high of 79.7°F (26.5°C). Interestingly, rainfall drops to 0.55" (14mm), a stark contrast to the past values, underlining July as the driest month of the year. Weather in July »
Weather in August
August in Kailua continues the comfort of the summer spirit created in July. Augmenting temperatures are observed ranging to a high of 80.2°F (26.8°C). Rainfall sees a slight increase to 0.75" (19mm), still maintaining the dry spell predominant in summer. Weather in August »
Weather in September
As summer’s end approaches in September, Kailua experiences a slight lift in temperature. The atmosphere maintains its contrast with high temperatures paired with increased rainfall to 0.94" (24mm). Winds level out to a comfortable average speed of 11.9mph (19.2km/h), putting forth an appeasing ambiance. Weather in September »
Weather in October
October's weather in Kailua signifies an oncoming autumn season with a slight drop in temperature and augmented precipitation. Gathering momentum from September, the rainfall intensifies to 1.46" (37mm), marking October as a wetter month with 16.5 rainfall days. Weather in October »
Weather in November
Kailua, Hawaii ushers in November with cooler weather, signifying a noticeable shift towards the winter months. The wind speeds pick up to 13mph (20.9km/h), adding a chill to the air. The sea water temperature drops to 78.4°F (25.8°C), modifying the atmosphere slightly. Weather in November »
Weather in December
December wraps up the year in Kailua with classic winter weather changes. Temperatures drop again to a lower limit of 73.2°F (22.9°C), enveloping the city with a pleasant chill. The rainfall amplifies to 1.57" (40mm), making it the wettest month of the year with 14.9 rainfall days. Weather in December »
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the least humid month in Kailua?
January and November, with an average relative humidity of 74%, are the least humid months.
How much does it rain in Kailua?
Throughout the year, there are 169.9 rainfall days, and 13.15" (334mm) of precipitation is accumulated.
When is the lowest UV index in Kailua?
January through June, November and December, with an average maximum UV index of 6, are months with the lowest UV index.
What part of the year is the coldest in Kailua?
Kailua's February weather reaches an average high of 74.5°F (23.6°C) and an average low of 70.5°F (21.4°C), making it the coldest month.
What is the wettest month in Kailua?
March is the month with the most rainfall. Rain falls for 16.9 days and accumulates 1.69" (43mm) of precipitation.
What month is the ocean coldest in Kailua?
The month with the coldest seawater in Kailua, Hawaii, is March, with an average ocean temperature of 75.7°F (24.3°C).
What is the most humid month in Kailua?
The months with the highest humidity in Kailua are April, June through August and December, with an average relative humidity of 76%.
When are the longest days in Kailua?
June has the longest days of the year in Kailua, Hawaii, with an average of 13h and 24min of daylight.
What month has the most sunshine in Kailua?
With an average of 11.2h of sunshine, June has the most sunshine of the year in Kailua, Hawaii.
What is the driest month in Kailua?
The month with the least rainfall in Kailua is July, when the rain falls for 11.8 days and typically collects 0.55" (14mm) of precipitation.
What are the months with the highest UV index in Kailua?
The months with the highest UV index are July through October, with an average maximum UV index of 7.
What are the warmest months in Kailua?
September is the month that records the highest temperatures in Kailua, with averages ranging from a high of 80.6°F (27°C) to a low of 77°F (25°C).
What is the month with the warmest ocean in Kailua?
With an average ocean temperature of 80.4°F (26.9°C), September is the month with the warmest seawater in Kailua, Hawaii.
What is the month with the shortest days in Kailua?
December has the shortest days of the year, with an average of 10h and 54min of daylight.
Is there Daylight Saving Time (DST) in Kailua?
Kailua, Hawaii, does not utilize Daylight Saving Time (DST). HST timezone is used over the entire year.
What is the month with the least sunshine in Kailua?
The month with the least sunshine in Kailua is December, with an average of 6.6h of sunshine.
Average temperature
Kailua, HI
The warmest month (with the highest average high temperature) is September (80.6°F).
The month with the lowest average high temperature is February (74.5°F).
The months with the highest average low temperature are September and October (77°F).
The coldest month (with the lowest average low temperature) is February (70.5°F).
Average pressure
Kailua, HI
- Average pressure in January:
30"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.04"Hg - Average pressure in June:
30.03"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
29.97"Hg - Average pressure in November:
30"Hg - Average pressure in December:
30"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed
Kailua, HI
- Average wind speed in January:
10.7mph - Average wind speed in February:
11.9mph - Average wind speed in March:
13.1mph - Average wind speed in April:
12.8mph - Average wind speed in May:
11.6mph - Average wind speed in June:
13.8mph
- Average wind speed in July:
14.1mph - Average wind speed in August:
13.7mph - Average wind speed in September:
11.9mph - Average wind speed in October:
11.2mph - Average wind speed in November:
13mph - Average wind speed in December:
12mph
The windiest month (with the highest average wind speed) is July (14.1mph).
The calmest month (with the lowest average wind speed) is January (10.7mph).
Average humidity
Kailua, HI
The months with the highest relative humidity are April, June, July, August and December (76%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall
Kailua, HI
- Average rainfall in January:
1.14" - Average rainfall in February:
1.34" - Average rainfall in March:
1.69" - Average rainfall in April:
0.98" - Average rainfall in May:
0.98" - Average rainfall in June:
0.79"
- Average rainfall in July:
0.55" - Average rainfall in August:
0.75" - Average rainfall in September:
0.94" - Average rainfall in October:
1.46" - Average rainfall in November:
0.94" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is March (1.69").
The driest month (with the least rainfall) is July (0.55").
Average rainfall days
Kailua, HI
- Average rainfall days in January:
12.6 days - Average rainfall days in February:
14.7 days - Average rainfall days in March:
16.9 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
11.3 days
- Average rainfall days in July:
11.8 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
13 days - Average rainfall days in October:
16.5 days - Average rainfall days in November:
14.4 days - Average rainfall days in December:
14.9 days
The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is June (11.3 days).
Average sea temperature
Kailua, HI
The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight / Average sunshine
Kailua, HI
- Average daylight in January:
11h and 0min - Average daylight in February:
11h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 1min - Average daylight in June:
13h and 2min
- Average daylight in July:
13h and 2min - Average daylight in August:
12h and 5min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 1min - Average daylight in December:
10h and 5min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in January:
8h and 4min - Average sunshine in February:
8h and 2min - Average sunshine in March:
8h and 2min - Average sunshine in April:
8h and 4min - Average sunshine in May:
10h and 5min - Average sunshine in June:
11h and 1min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 1min - Average sunshine in September:
9h and 2min - Average sunshine in October:
8h and 3min - Average sunshine in November:
6h and 5min - Average sunshine in December:
6h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days
Kailua, HI
- Average sunshine days in January:
12.8 days - Average sunshine days in February:
8.2 days - Average sunshine days in March:
6.6 days - Average sunshine days in April:
7.3 days - Average sunshine days in May:
9.3 days - Average sunshine days in June:
13.6 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
12.8 days - Average sunshine days in September:
11 days - Average sunshine days in October:
7 days - Average sunshine days in November:
6.6 days - Average sunshine days in December:
8.1 days
The month with the most sunshine days is June (13.6 days).
The months with the least sunshine days are March and November (6.6 days).
Average UV index
Kailua, HI
The months with the highest UV index are July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, November and December (UV index 6).
Average cloud cover
Kailua, HI
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is September (Cloud cover 27).
Average visibility
Kailua, HI
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Kailua, Hawaii, USA
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