Climate and monthly weather forecast
Kailua-Kona, HI

Kailua-Kona, a picturesque and tranquil city located on the west coast of the Island of Hawaii, boasts a climate system falling under the Köppen climate classification of Cfb - signifying a marine west coast climate with warm summers. The town is nestled on the slopes of Mauna Loa, serving as a buffer against the traditional climatic zones often noted for tropical Hawaii.

The city's hallmark can be attributed to consistent weather patterns year-round, with a cycle of warm to hot temperatures and minimal seasonal variation. On average, the high temperature fluctuates from 81.2°F (27.3°C) at the onset of the year to a peak of 86.9°F (30.5°C) in August. The lowest temperatures are not very far behind, demonstrating a mild cooling effect with a cycle moving from 68°F (20°C) up to 75.1°F (23.9°C) through the course of the year.

Rainfall in Kailua-Kona widely varies but remains somewhat moderate. The quantity of rainfall measures from a low 0.7" (18mm) in July, slightly increasing up to 2.8" (71mm) in December. The sea temperature sustains an almost unbroken pattern. Starting from 76°F (24.4°C) in March, it gently ascends to reach a high of 80°F (26.7°C) from September to October before gradually falling back to 76.6°F (24.8°C) at the year's end.

These parameters illustrate that Kailua-Kona's climate is characteristically equable, subject to unswerving patterns of relatively high temperatures and temperate rainfall, enriched by an invitingly warm sea temperature.

Drawing upon climatic elements and patterns, the period from May to August emerges as an ideal window to visit Kailua-Kona. The city bathes in warm temperatures ranging from highs of 83°F (28.3°C) to 86.9°F (30.5°C) and lows of 71.6°F (22°C) to 75.1°F (23.9°C), accompanied by mild rainfall not exceeding 1 inch throughout these months. Concurrently, the sea temperature offers an inviting span between 77.4°F (25.2°C) and 79.5°F (26.4°C). Furthermore, the season showcases the longest periods of daylight, with an average of 13.2 hours in July, hence guaranteeing extended periods of sunshine for outdoor activities.

Conversely, December can be classified as the less favourable month for a visit due to Kailua-Kona experiencing its peak rainfall of 2.8" (71mm) then. Concurrently at this time, the daily low temperature is at its second lowest point, clocking in at 69.4°F (20.8°C), as sea temperatures also drop to 77.4°F (25.2°C).

Marked by an uptick in temperatures and hours of daylight, Spring in Kailua-Kona arises with warmer weather. Temperature highs escalate from 82.2°F (27.9°C) in March to 83.5°F (28.6°C) in May, while the lows similarly increase from 70°F (21.1°C) to 71.6°F (22°C). Rainfall during this period is moderately low, oscillating between 1.8" (46mm) and 2" (51mm). Sea temperatures range from 76°F (24.4°C) in March to 77.4°F (25.2°C) in May. The daylight hours extend from 12.1 hours to 13.1 hours, making it an excellent season for outdoor excursions.

Into the Summer months, Kailua-Kona witnesses its hottest period, with high temperatures touching 86°F (30°C) in June and peaking at 86.9°F (30.5°C) in August. Low temperatures also rise, with a swing from 73.6°F (23.1°C) to 75.1°F (23.9°C). This season experiences the least rainfall, with figures fluctuating from 0.7" (18mm) to 1.4" (36mm). Sea temperatures suffice for swimming, displaying warmth between 78.1°F (25.6°C) and 79.5°F (26.4°C). Long sunset-lit evenings are promised, with daylight hours ranging from 13.3 hours in June to 12.8 hours in August.

Autumn in Kailua-Kona comes with moderately high temperatures, starting at 86.8°F (30.4°C) in September and dropping to 84.2°F (29°C) by November. The low temperatures run between 74.6°F (23.7°C) and 71.8°F (22.1°C). Rainfall slightly increases through these months, from 0.8" (20mm) to 1.3" (33mm). The sea remains warm and enticing, with temperatures hovering from 80°F (26.7°C) to 78.7°F (25.9°C). Simultaneously, daylight hours begin to reduce, drawing back from 12.2 hours to 11.2 hours.

Winter brings a cooler edge to Kailua-Kona's climate, though still displaying pleasant weather. The high temperatures recede from 82.5°F (28.1°C) in December to 81.6°F (27.6°C) in February. The lows dip from 69.4°F (20.8°C) to 68.2°F (20.1°C). Rainfall sees an upsurge, peaking at 2.8" (71mm) in December and then falling to 1.5" (38mm) by February. Sea temperatures float from 77.4°F (25.2°C) down to 76.6°F (24.8°C) while daylight hours reduce to 11 hours in December and February. This season, regardless of higher rainfall, still presents enjoyable weather for those seeking a mild winter escape.

In the first month of the year, the weather in Kailua-Kona, Hawaii blends the aforementioned climate extremes. Residents experienced temperatures from 68.2°F (20.1°C) to 81.6°F (27.6°C). Since this is a coastal city, the moderately high temperatures blend with the sea breezes for a refreshing ambiance. Weather in January »

Kailua-Kona's February weather shows a minor drop in sea and air temperatures. Values manifested a slight fluctuation from January temperatures, with the sea temperature at 76.4°F (24.7°C). Unlike other regions of the United States dealing with harsh winter conditions, this Hawaiian city retains its tropical charm. Weather in February »

Residents in Kailua-Kona witness a transition in the weather during March. The city experiences the least fluctuation in temperatures during this period, with a high of 82.2°F (27.9°C). March marks the onset of longer days due to spring equinox, adding more daylight for activities. Weather in March »

Kailua-Kona's weather records a gentle increase in temperature and reduced rainfall in April. As the season transition becomes prominent, daytime temperatures rise to a high of 83°F (28.3°C). With the arrival of spring, the city basks in more daylight hours, promoting outdoor activities. Weather in April »

May leaves behind the fluctuating temperatures of April and embraces steadier weather patterns. The rise in both land and sea temperature gets noticed, registering sea temperatures of 77.4°F (25.2°C). The city's coastal location and tropical climate connote a substantial increase in daylight hours. Weather in May »

Kailua-Kona in June is a pure delight, as one can expect long sunny days due to the summer solstice. With an increase in temperatures that peak at 85°F (29.4°C), residents appreciate the clear blue Hawaiian skies. The sea temperature takes a leap, and the daylight hours are elongated. Weather in June »

July stands out as the warmest month in Kailua-Kona, registering temperature highs of 86°F (30°C). The increased warmth combined with prolonged daylight hours, characteristic of the Hawaiian summer, allows for bustling outdoor activities. Weather in July »

August, in Kailua-Kona, marks the plateau of high temperatures and dwindling rainfall. The sea temperature reaches its annual peak, measuring 79.5°F (26.4°C). This month comprises long days of sunlight, though daylight hours start to wane gradually. Weather in August »

September brings a halt to the hot weather trends, as Kailua-Kona experiences a relief from the summer heat. The city encounters a slight dip in temperatures, with sea temperatures at 80°F (26.7°C). Despite the reduction in temperatures and daylight hours, the dry environment persists with minimal rainfall. Weather in September »

October in Kailua-Kona is unique for its balanced weather conditions. The city witnesses a further decline trend, with daytime temperatures averaging 86°F (30°C). As the city approaches the end of the dry season, the rainfall begins to make a gradual comeback. Weather in October »

November brings Kailua-Kona a sense of calmness as the peak tourist season winds down. Despite a drop in temperatures, the city records a pleasant weather with sea temperatures at 78.7°F (25.9°C). A marked reduction in daylight hours suggests the oncoming winter solstice. Weather in November »

December marks the end of the year, with Kailua-Kona transitioning towards lower temperatures and increased precipitation. The lowest temperatures range from 69.4°F (20.8°C) to 82.5°F (28.1°C), providing a sense of mild winters. Weather in December »