Climate and monthly weather forecast
Kahului, HI

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The climate of Kahului

Kahului, Hawaii, characterized under the Köppen climate classification as Af, displays a prominent Tropical Rainforest climate. Located in the Pacific ocean, the region sees relatively consistent patterns of temperature, humidity, and rainfall throughout the year, making it an evergreen destination.

The usual range for average high temperatures lies from 73.9°F (23.3°C) to 79.9°F (26.6°C), reflecting the warm and lush nature of the area. The lowest average temperatures tend to linger from 70.7°F (21.5°C) to 76.5°F (24.7°C) - a modest difference, pointing towards the region's stable thermal conditions. Kahului is no stranger to humidity - a consistent humidity trend of 74% to 76% prevails throughout the year, reinforcing the damp, tropical climate.

Precipitation in Kahului ranges from a low of 0.2" (5mm) to a high of 0.87" (22mm) monthly. This variation in rainfall is frequent throughout the year, with minimal months showing an absence of rain. The area experiences 6.6 to 11.9 days of rainfall on average, substantiating a healthy volume of rainfall spread through the year rather than concentrated in certain months. An important factor to highlight is the visibility in Kahului - stable at 6 miles throughout the year, indicating clear and unobstructed sightlines for most of the year.

The best time to visit Kahului

Based on the availability of optimal weather conditions, May through July offer the best times to visit Kahului. During these months, the island city experiences an average high temperature of 77°F (25°C) to 78.5°F (25.8°C), an average rainfall of 0.2" (5mm) to 0.39" (10mm), and an average of 6.6 to 8.5 days of rainfall. With over 11 hours of daylight, around 11.5 hours of sunshine, and a consistent visibility of 6 miles, these combine to provide the ideal conditions for outdoor activities and exploration.

The worst time to visit Kahului

While Kahului's weather presents relatively mild fluctuations, the months requiring a bit more caution, are March and December. In these months, rainfall reaches its peak with up to 0.87" (22mm) of rainfall spread across 9.2 to 11.9 days. Despite these rainy periods, the temperatures stay relatively mild between 73.9°F (23.3°C) to 74.7°F (23.7°C). However, potential visitors may want to consider these weather conditions before planning their trip.

Spring weather in Kahului

Spring descends upon Kahului between March and May, presenting temperatures varying from 70.7°F (21.5°C) to 73.4°F (23°C). Rainfall during this season averages between 0.63" (16mm) to 0.87" (22mm), with the number of rainy days being 8.1 to 11.9. As Spring advances, weather conditions gradually improve with increasing hours of sunlight, making it a pleasant period to experience Kahului's natural beauty.

Summer weather in Kahului

Kahului's summer spans June through August, characterized by average temperatures from 74.7°F (23.7°C) to 76.3°F (24.6°C), and some of the least amounts of rainfall - ranging from 0.2" (5mm) to 0.43" (11mm). The city experiences longer sunlight hours, reaching 13.4 hours in June and slowly decreasing towards August. Along with increased daylight comes an increased UV index, ensuring ample opportunity for those looking to soak up the tropical sun.

Autumn weather in Kahului

Autumn in Kahului lasts from September through November. The temperature, on average, lies from 74.8°F (23.8°C) to 76.5°F (24.7°C), while the rainfall varies from 0.39" (10mm) to 0.55" (14mm). This season experiences fewer hours of daylight and sunshine, but maintains a similar level of humidity compared to other seasons. Despite the rains, the climate remains relatively warm and pleasant.

Winter weather in Kahului

Winter arrives in Kahului in December, with temperatures dipping slightly from 72.9°F (22.7°C) to 75.7°F (24.3°C). Rainfall during this season shows a noticeable increase reaching up to 0.87" (22mm), spread over 7.7 to 9.2 days. Daylight hours experience a minor reduction, but this does not significantly affect the overall pleasant winter climate of Kahului. Along with these, the sea temperature dips to 76.8°F (24.9°C), making it a season prioritized more towards relaxation than water-based activities.

Weather in January

Being the first month of the year, January in Kahului, Hawaii, is characterized by a mild and pleasant weather pattern. Temperatures oscillate between 71.6°F (22°C) and 74.7°F (23.7°C). This makes January ideal for beachside relaxation, as the gentle breeze complements the warm air rather perfectly. Weather in January »

Weather in February

Proceeding into February, there is a slight decline in temperatures which are now moving from 70.7°F (21.5°C) to 73.9°F (23.3°C). Notably, this month perceive an escalation in rainfall frequency as well. Nevertheless, the weather remains fairly congenial for explorations across the city. Weather in February »

Weather in March

When it comes to March, the weather undergoes another mild change, but maintains its charming disposition. Though the frequency of rainy days experiences a surge, it still remains within manageable boundaries. With temperatures oscillating from 70.7°F (21.5°C) to 74.3°F (23.5°C), the days continue being agreeably warm. Weather in March »

Weather in April

Investigating the weather conditions in April, it becomes evident that the rise in temperatures is discernible as they now range between 72.1°F (22.3°C) to 75.6°F (24.2°C). Meanwhile, the city witnesses a drop in rain showers which certainly broadens the prospects for outdoor recreations. Weather in April »

Weather in May

By the time May arrives, Kahului has already begun to display the signs of the approaching tropical summer. The increased daylight hours coupled with longer sunshine duration facilitate longer days packed with outdoor activities. In this month, temperatures swing from 73.4°F (23°C) to a warming 77°F (25°C). Weather in May »

Weather in June

June can be regarded as the onset of the true tropical summer in Kahului, with temperatures sailing from 74.7°F (23.7°C) to 77.9°F (25.5°C). Abundant sunshine, lenient winds, and controlled humidity accentuate the allure of the beachside city. Weather in June »

Weather in July

July in Kahului is the epitome of tropical summer, with the mercury hovering between 75.6°F (24.2°C) and 78.8°F (26°C). Brilliant sunshine embellishes the city, and the sea surface temperature rises slightly, making water-related activities all the more enticing. Weather in July »

Weather in August

With temperatures soaring from 76.3°F (24.6°C) to 79.5°F (26.4°C) in August, the tropical vibe intensifies. But Kahului doesn't let the heat become overbearing thanks to its regularly flowing breeze. Humidity escalates, albeit marginally, but it hardly leads to discomfort. Weather in August »

Weather in September

September displays a splendid balance between cool winds and warmth with temperature scales swaying between 76.1°F (24.5°C) and 79.9°F (26.6°C). Although this month sees a mild amplification in rainfall, it's hardly a reason for concern. Weather in September »

Weather in October

Moving on to October, there is a minor dip in the temperatures, now spanning from 76.5°F (24.7°C) to 79.3°F (26.3°C). The trend of gentle winds caressing the city persists, and the overall humidity remains, well, unchanging. Weather in October »

Weather in November

November in Kahului displays an evident transition from the tropical conditions to cooler winds. The weather adorns a refreshing hue with temperatures varying between 74.8°F (23.8°C) and 77.7°F (25.4°C). Though rain showers become more frequent, the city's overall aura stays heartening, courtesy of the benevolent sunshine. Weather in November »

Weather in December

December brings the year to a close with a cool demeanor, as temperatures fluctuate from 72.9°F (22.7°C) to 75.7°F (24.3°C). While the rainfall frequency escalates, it's quite well-balanced by the city's prolonged sunshine hours. Weather in December »
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Frequently asked questions

What is the least humid month in Kahului?

January and February, with an average relative humidity of 74%, are the least humid months in Kahului, Hawaii.

How many days does it rain in Kahului?

Throughout the year, there are 103.4 rainfall days, and 6.57" (167mm) of precipitation is accumulated.

When is the lowest UV index in Kahului?

The months with the lowest UV index in Kahului, Hawaii, are January through June, November and December, with an average maximum UV index of 6.

What month is the coldest in Kahului?

Temperature readings reach their annual highs in February, averaging 73.9°F (23.3°C) and a minimum average of 70.7°F (21.5°C).

What is the wettest month in Kahului?

The wettest months in Kahului, Hawaii, are March and December, with an average 0.87" (22mm) of rainfall.

What is the month with the coldest ocean in Kahului?

The month with the coldest seawater in Kahului is March, with an average ocean temperature of 75.7°F (24.3°C).

What is the driest month in Kahului?

The month with the least rainfall in Kahului is June, when the rain falls for 6.6 days and typically collects 0.2" (5mm) of precipitation.

When are the longest days in Kahului?

June has the longest days of the year in Kahului, with an average of 13h and 24min of daylight.

What month has the most sunshine in Kahului?

The month with the most sunshine is June, with an average of 11.5h of sunshine.

What are the most humid months in Kahului?

The months with the highest humidity are July and August, with an average relative humidity of 76%.

What are the months with the highest UV index in Kahului?

The months with the highest UV index are July through October, with an average maximum UV index of 7.

What is the hottest time of year in Kahului?

Kahului's temperature records reveal September as the warmest month, marked by average highs of 79.9°F (26.6°C) and lows of 76.1°F (24.5°C).

What is the month with the warmest ocean in Kahului?

The month with the warmest seawater is September, with an average ocean temperature of 80.1°F (26.7°C).

What is the month with the shortest days in Kahului?

With an average of 10h and 54min of daylight, December has the shortest days of the year.

Is there Daylight Saving Time (DST) in Kahului?

Kahului does not utilize Daylight Saving Time (DST). HST timezone is used over the entire year.

What is the month with the least sunshine in Kahului?

With an average of 7h of sunshine, December has the least sunshine of the year in Kahului, Hawaii.

Average temperature
Kahului, HI

Average temperature - Kahului, HI

The warmest month (with the highest average high temperature) is September (79.9°F).
The month with the lowest average high temperature is February (73.9°F).

The month with the highest average low temperature is October (76.5°F).
The coldest months (with the lowest average low temperature) are February and March (70.7°F).

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Average pressure
Kahului, HI

Average pressure - Kahului, HI

The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

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Average wind speed
Kahului, HI

Average wind speed - Kahului, HI

The windiest month (with the highest average wind speed) is June (13.6mph).
The calmest month (with the lowest average wind speed) is January (10.4mph).

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Average humidity
Kahului, HI

Average humidity - Kahului, HI

The months with the highest relative humidity are July and August (76%).
The months with the lowest relative humidity are January and February (74%).

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Average rainfall
Kahului, HI

Average rainfall - Kahului, HI

The wettest months (with the highest rainfall) are March and December (0.87").
The driest month (with the least rainfall) is June (0.2").

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Average rainfall days
Kahului, HI

Average rainfall days - Kahului, HI

The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is June (6.6 days).

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Average sea temperature
Kahului, HI

Average sea temperature - Kahului, HI

The best month for swimming (with the highest average sea temperature) is September (80°F).
The coldest month (with the lowest average sea temperature) is March (75.6°F).

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Average daylight / Average sunshine
Kahului, HI

Average daylight / Average sunshine - Kahului, HI

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).

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

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Average sunshine days
Kahului, HI

Average sunshine days - Kahului, HI

The month with the most sunshine days is June (19.9 days).
The month with the least sunshine days is March (15.2 days).

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Average UV index
Kahului, HI

Average UV index - Kahului, 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).

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Average visibility
Kahului, HI

Average visibility - Kahului, 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).

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Kahului, Hawaii, USA

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