December weather forecastKapaa, HI

December

Weather in December

December in Kapaa, Hawaii welcomes the holiday season with typical cooler conditions. This month registers the lowest sea temperature at 76.6°F (24.8°C). As the year draws to a close, a gradual reduction in temperature and daylight hours is observed. Despite these shifts, sunshine hours remain fairly constant due to the persistent weather phenomenon typical of Hawaii. The diminished wind speeds further enhance the serene mood of this month.

Temperature

The average high-temperature is a still moderately hot 75.4°F (24.1°C) in December, hardly different from the 77.2°F (25.1°C) recorded in November. During December, Kapaa perceives a slight decrease in temperature from daytime highs, settling at an average low of 71.8°F (22.1°C).

Humidity

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

Rainfall

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

Ocean temperature

In December, the average ocean temperature in Kapaa is 76.6°F (24.8°C).
Note: For someone sensitive to cold, swimming in 76.6°F (24.8°C) waters can be invigorating, especially when considering elements like sunshine, wind, and current air temperature. (As a reference, Olympic swimming waters are kept between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The month with the shortest days in Kapaa is December, with an average of 10h and 48min of daylight.
On the first day of December, sunrise is at 7:00 am and sunset at 5:53 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 6:05 pm HST.

Sunshine

The average sunshine in December is 6.4h.

UV index

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 6 suggests these recommendations:
Fend off overexposure. Sun protection is vital. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Take note! The UV strength of the Sun elevates when reflected off water and sand.

Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Kapaa, in December, the average high-temperature is 75.4°F (24.1°C), and the average low-temperature is 71.8°F (22.1°C).

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

In Kapaa, the average relative humidity in December is 77%.

In Kapaa, in December, it is raining for 18.1 days, with typically 2.2" (56mm) of accumulated precipitation.

In December, the average ocean temperature in Kapaa is 76.6°F (24.8°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 76.6°F (24.8°C) water may be enjoyable.

The month with the shortest days is December, with an average of 10h and 48min of daylight.

The average day length in December is 10h and 49min.

In December, on the first day of the month, sunrise is at 7:00 am and sunset at 5:53 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 6:05 pm HST.

In Kapaa, the average sunshine duration in December is 6.4h.

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

In December, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

77.2°F

75.4°F

74.7°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

12.6mph

11.7mph

10.4mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

19.2

18.1

12.5

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

4.7

6.7

12.8

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Kapaa, 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
Kapaa, 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
Kapaa, 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
Kapaa, 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
Kapaa, 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
Kapaa, 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
Kapaa, HI

Average sea temperature in December: 76.6°F

The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (74.8°F).

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

Average daylight in December: 10h and 48min

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 24min

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
Kapaa, 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
Kapaa, 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
Kapaa, 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
Kapaa, 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).