Climate and monthly weather forecastKailua, HI

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.

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 »