December 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

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). While the weather characteristics largely resemble the month of November, December stands distinguishable with its shortest days and prolonged pleasant evenings.

Temperature

The beginning of December records an average high-temperature of a still warm 75.4°F (24.1°C), almost echoing the conditions of the previous month. December's average low temperature is a pleasant 71.8°F (22.1°C), displaying a subtle drop from its daily peak.

Humidity

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

Rainfall

In Hanalei, in December, it is raining for 18.1 days, with typically 2.2" (56mm) of accumulated precipitation. In Hanalei, during the entire year, the rain falls for 218.4 days and collects up to 22.13" (562mm) of precipitation.

Ocean temperature

In Hanalei, the average seawater temperature in December is 77°F (25°C).
Note: Between the temperatures of 77°F (25°C) and 84.2°F (29°C), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

December has the shortest days of the year, with an average of 10h and 48min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 5:53 pm. On the last day of December, sunrise is at 7:17 am and sunset at 6:05 pm HST.

Sunshine

In December, the average sunshine is 6.4h.

UV index

The months with the lowest UV index are January through August, October through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: In December, a daily maximum UV index of 6 leads to the following instructions:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Always opt for UVA and UVB-resistant sunglasses on radiant days. Caution! The Sun's UV rays become stronger due to reflections from water and sand.

Frequently asked questions

What are December temperatures?

December temperatures vary between a high-temperature of 75.4°F (24.1°C) and a low-temperature of 71.8°F (22.1°C).

What is the most humid month?

The months with the highest humidity are June through August, October and December, with an average relative humidity of 77%.

What is the average humidity in December?

In December, the average relative humidity is 77%.

How many days does it rain in December?

In Hanalei, during December, the rain falls for 18.1 days and regularly aggregates up to 2.2" (56mm) of precipitation.

What is the water temperature in December?

In Hanalei, the average seawater temperature in December is 77°F (25°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the month with the shortest days in Hanalei?

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

How many hours of daylight does Hanalei have in December?

In Hanalei, the average day length in December is 10h and 48min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 5:53 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 6:05 pm HST.

How many hours of sunshine does Hanalei have in December?

The average sunshine duration in December is 6.4h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in December
Hanalei, HI

Average temperature in December - Hanalei, HI
  • Average high temperature in December: 75.4°F

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).

  • Average low temperature in December: 71.8°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).

Average pressure in December
Hanalei, HI

Average pressure in December - Hanalei, HI
  • Average pressure in December: 30.01"Hg

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).

Average wind speed in December
Hanalei, HI

Average wind speed in December - Hanalei, HI
  • Average wind speed in December: 11.2mph

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).

Average humidity in December
Hanalei, HI

Average humidity in December - Hanalei, HI
  • Average humidity in December: 77%

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%).

Average rainfall in December
Hanalei, HI

Average rainfall in December - Hanalei, HI
  • Average rainfall in December: 2.2"

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

Average rainfall days in December
Hanalei, HI

Average rainfall days in December - Hanalei, HI
  • Average rainfall days in December: 18.1 days

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).

Average sea temperature in December
Hanalei, HI

Average sea temperature in December - Hanalei, HI
  • Average sea temperature in December: 77°F

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).

Average daylight in December /
Average sunshine in December
Hanalei, HI

Average daylight in December / Average sunshine in December - Hanalei, HI
  • Average daylight in December: 10h and 5min

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).

  • Average sunshine in December: 6h and 2min

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).

Average sunshine days in December
Hanalei, HI

Average sunshine days in December - Hanalei, HI
  • Average sunshine days in December: 6.7 days

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

Average UV index in December
Hanalei, HI

Average UV index in December - Hanalei, HI
  • Average UV index in December: 6

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).

Average cloud cover in December
Hanalei, HI

Average cloud cover in December - Hanalei, HI
  • Average cloud cover in December: 42

The month with the most cloud cover is March (Cloud cover 47).
The months with the least cloud cover are January and September (Cloud cover 38).

Average visibility in December
Hanalei, HI

Average visibility in December - Hanalei, HI
  • Average visibility in December: 6mi

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).

Hanalei, Hawaii, USA

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