Climate and monthly weather forecast
Hanalei, HI

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The vast Taro farm fields in the valley of Hanalei, Hawaii, with beautiful cloudy skies and mountains
The vast Taro farm fields in the valley of Hanalei, Hawaii, with beautiful cloudy skies and mountains

The climate of Hanalei

Known for a predominantly tropical climate, Hanalei, Hawaii, USA, is classified as Af according to the Köppen climate classification. This suggests a tropical rainforest climate, with a significant amount of rainfall occurring throughout the year. Geographically located in northern of Kauai island, Hanalei's climate can be characterized by hot summers and mild winters.

Moving on to the weather parameters outlined, yearly temperature highs in Hanalei fluctuate from 73.2°F (22.9°C) to 79.7°F (26.5°C), while the lows register between 68.5°F (20.3°C) and 75.9°F (24.4°C). It's worth noting that the relative humidity is rather high, ranging from 75 to 77%, contributing to a rather moist environment. Rainfall is prevalent, observed in a high frequency of days throughout the year -- from 12.5 to 21.1 days per month. Monthly rainfall figures vary between 1.3" (33mm) and 2.52" (64mm).

Observers will note that the sea surface temperature is generally warm, from 75°F (23.9°C) to 81°F (27.2°C). Meanwhile, daylight ranges from 10.8 hours to 13.5 hours, offering extended periods of sunlight particularly during the mid-year. Sunshine hours maintain a similar trend, from 6.2 hours to 9.7 hours.

The best time to visit Hanalei

While weather preferences are to a large extent individual, visitors seeking the highest temperatures and most sunlight might target the period from June to September. During this period, the temperatures scale towards the upper end, from 78.3°F (25.7°C) to 79.7°F (26.5°C). The sunlight is also at its peak with 13.2 to 13.5 hours of daylight, and sunshine ranging from 8.4 to 9.7 hours.

The worst time to visit Hanalei

Considering periods of increased rainfall and lower temperatures, the initial months of the year may be less appealing for some travellers. From February to April, rainfall is highest, reaching up to 2.52" (64mm), and the number of rainfall days extends to 18.6 days a month. This period also coincides with relatively lower temperatures varying from 68.5°F (20.3°C) to 70.9°F (21.6°C).

Spring weather in Hanalei

Notably warmer than winter, the spring months in Hanalei experience temperature highs oscillating from 73.2°F (22.9°C) in March to 76.8°F (24.9°C) in May. The temperature lows during this period range between 68.9°F (20.5°C) and 72.1°F (22.3°C). While daylight extends from 12 hours in March to 13.2 hours in May, rain remains a constant companion with a frequency of 18.3 to 18.5 days a month and accumulated rainfall from 1.3" (33mm) to 1.57" (40mm).

Summer weather in Hanalei

The heralding of summer in Hanalei conveys higher temperature ranges from 78.3°F (25.7°C) in June to a peak of 79.7°F (26.5°C) in September, while the lows fluctuate between 73.9°F (23.3°C) and 75.9°F (24.4°C). Although rainfall persists, the volume decreases slightly to between 1.77" (45mm) and 1.85" (47mm). Importantly, daylight extends to its yearly maximum of up to 13.5 hours with longer sunshine hours of up to 9.7 hours in June.

Autumn weather in Hanalei

Autumn in Hanalei ushers in a mild decrease in temperatures, with highs of 79.5°F (26.4°C) in October to 77.2°F (25.1°C) in November. The lows during this period rest at a range from 75.4°F (24.1°C) to 74.1°F (23.4°C). Rainfall shows a marked increase reaching 2.05" (52mm) both in October and November, with up to 19.2 rainy days in November.

Winter weather in Hanalei

Winter is relatively mild in Hanalei with highest temperatures ranging from 77.2°F (25.1°C) in December to 73.2°F (22.9°C) in February. Low temperatures follow a similar trend hovering from 71.8°F (22.1°C) to 68.5°F (20.3°C). The prominent feature of winter is the increase in rainfall, escalating to 2.2" (56mm) in December and the number of rainy days reaching up to 18.1 in the same month.

Weather in January

The first month of the year in Hanalei, Hawaii, opens with stable and mild weather conditions. It follows closely on the heels of December, offering relatively similar weather features. A bit more sunlight could be enjoyed during the day with an average of 11 hours of daylight. Weather in January »

Weather in February

February becomes a bridge between the relatively cooler weather in January and a warmer March in Hanalei. The days become longer and, along with witnessing more daylight, residents see a marginal increase in rainfall to 1.81" (46mm) that adds to the humidity. Weather in February »

Weather in March

March signals the arrival of spring in Hanalei, marking a noticeable increase in average temperatures and offering longer daylight hours. Along with longer hours of sunshine, the weather routine sees a more substantial difference in rainfall, peaking at 2.52" (64mm). Weather in March »

Weather in April

The weather in April holds a unique place in Hanalei's calendar as it fuses the onset of spring with the prelude to summer. The weather pattern from March continues, albeit with diminished rainfall levels. Headlining the month is the significant increase in daylight hours, up to 12.7, paving the way for more sun-soaked days. Weather in April »

Weather in May

May ushers in the summer season, bringing with it the warmest temperatures Hanalei sees all year. The standout feature in May's weather is an increase in both daytime temperatures to 76.8°F (24.9°C) and sea temperature to 77°F (25°C). Weather in May »

Weather in June

Hanalei's weather in June serves as an archetypical representation of tropical summer, following the warming trend that starts in May. On average, Hanalei enjoys longest daylight hours compared to other months. Pressure drops slightly from 30.05" (763mm) in May to 30.04" (763mm) in June, hinting at the approaching rainy season. Weather in June »

Weather in July

July starts off subtly with a slight dip in sunshine hours from June's high, while marking the advent of the warmest month of the year in Hanalei. The conspicuous feature of July's weather is the temperature, peaking at 79°F (26.1°C). Weather in July »

Weather in August

As August arrives in Hanalei, a discernible weather transition takes place, highlighted primarily by the rise in relative humidity up to 77%. Alongside this, the weather characterization sees both the highest sea temperatures and highest maximum temperatures of 79.7°F (26.5°C). Weather in August »

Weather in September

September is known in Hanalei for signaling the outset of autumn marking a decrease in both soaring temperatures and high rainfall levels from August. Slightly cooler temperatures and reduced rainfall, coupled with consistent sea temperatures at 81°F (27.2°C), render September conducive for beach activities. Weather in September »

Weather in October

October offers Hanalei residents a welcome respite from the September heat, setting the stage for cooler weather as the year continues its course. The key indicator of October's weather transformation is a decline in the daily amount of sunshine to 8.4 hours. Weather in October »

Weather in November

Things become more balanced in November, as Hanalei begins to transition into the cooler winter season. November's weather is characterized by a slight drop in both daytime and sea temperatures. The gradual decline in temperature, together with the higher rainfall of 2.05" (52mm) in comparison to October, makes November a relatively cooler harbinger of the coming colder December. Upon the beginning of November, Hanalei's high-temperatures register at a still moderately hot 77.2°F (25.1°C), closely mirroring the preceding month. Weather in November »

Weather in December

By the time December rolls around, the weather in Hanalei has turned noticeably cooler, with the year happily ending on a pleasant note. Featuring the shortest daylight hours of the year at 10.8, the sea temperatures also fall back to 77°F (25°C). Weather in December »
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Frequently asked questions

What is the least humid month in Hanalei?

The least humid month is January, with an average relative humidity of 75%.

How much does it rain in Hanalei?

Throughout the year, in Hanalei, Hawaii, there are 218.4 rainfall days, and 22.13" (562mm) of precipitation is accumulated.

When is the ocean coldest in Hanalei?

January through April, with an average ocean temperature of 75.2°F (24°C), are months with the coldest seawater.

When is the lowest UV index in Hanalei?

The months with the lowest UV index in Hanalei are January through August, October through December, with an average maximum UV index of 6.

What are the coldest months in Hanalei?

The yearly lowest temperatures occur in February and March, averaging a high-temperature of 73.2°F (22.9°C).

What is the rainiest month in Hanalei?

March is the month with the most rainfall in Hanalei, Hawaii. Rain falls for 18.6 days and accumulates 2.52" (64mm) of precipitation.

What is the driest month in Hanalei?

The month with the least rainfall in Hanalei is April, when the rain falls for 18.3 days and typically collects 1.3" (33mm) of precipitation.

What are the most humid months in Hanalei?

June through August, October and December, with an average relative humidity of 77%, are most humid months in Hanalei, Hawaii.

When are the longest days in Hanalei?

With an average of 13h and 30min of daylight, June has the longest days of the year in Hanalei, Hawaii.

What month has the most sunshine in Hanalei?

June has the most sunshine of the year in Hanalei, Hawaii, with an average of 9.7h of sunshine.

What month is the hottest in Hanalei?

In Hanalei, Hawaii, the average temperatures in September are the highest, with a peak at 79.7°F (26.5°C) and a low of 75.9°F (24.4°C).

When is the ocean warmest in Hanalei?

September and October, with an average ocean temperature of 80.6°F (27°C), are months with the warmest seawater in Hanalei, Hawaii.

When is the highest UV index in Hanalei?

With an average maximum UV index of 7, September is the month with the highest UV index.

What is the month with the least sunshine in Hanalei?

The month with the least sunshine in Hanalei, Hawaii, is November, with an average of 6.2h of sunshine.

What is the month with the shortest days in Hanalei?

December has the shortest days of the year in Hanalei, Hawaii, with an average of 10h and 48min of daylight.

Is there Daylight Saving Time (DST) in Hanalei?

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

Average temperature
Hanalei, HI

Average temperature - Hanalei, HI

The warmest month (with the highest average high temperature) is September (79.7°F).
The months with the lowest average high temperature are February and March (73.2°F).

The month with the highest average low temperature is September (75.9°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).

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Average pressure
Hanalei, HI

Average pressure - Hanalei, HI

The month with the highest atmospheric pressure is April (30.07"Hg).
The months with the lowest atmospheric pressure are September and October (29.98"Hg).

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Average wind speed
Hanalei, HI

Average wind speed - Hanalei, HI

The windiest month (with the highest average wind speed) is July (12.3mph).
The calmest month (with the lowest average wind speed) is January (10mph).

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Average humidity
Hanalei, HI

Average humidity - Hanalei, HI

The months with the highest relative humidity are June, July, August, October and December (77%).
The month with the lowest relative humidity is January (75%).

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Average rainfall
Hanalei, HI

Average rainfall - Hanalei, HI

The wettest month (with the highest rainfall) is March (2.52").
The driest month (with the least rainfall) is April (1.3").

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Average rainfall days
Hanalei, HI

Average rainfall days - Hanalei, HI

The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is January (12.5 days).

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Average sea temperature
Hanalei, HI

Average sea temperature - Hanalei, HI

The best months for swimming (with the highest average sea temperature) are September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

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Average daylight / Average sunshine
Hanalei, HI

Average daylight / Average sunshine - Hanalei, HI

The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).

The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).

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Average sunshine days
Hanalei, HI

Average sunshine days - Hanalei, HI

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is August (2.9 days).

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Average UV index
Hanalei, HI

Average UV index - Hanalei, HI

The month with the highest UV index is September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 6).

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Average visibility
Hanalei, HI

Average visibility - Hanalei, 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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Hanalei, Hawaii, USA

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