Waimalu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Waimalu, HI

December, the first month of the winter, in Waimalu, is also a moderately hot month, with average temperature varying between 70.5°F (21.4°C) and 76.5°F (24.7°C).

Temperature

In Waimalu, the average high-temperature in December is practically the same as in November - a still moderately hot 76.5°F (24.7°C). The average low-temperature, in December, is 70.5°F (21.4°C).

Humidity

February and December, with an average relative humidity of 76%, are most humid months in Waimalu.

Rainfall

In Waimalu, Hawaii, in December, it is raining for 17 days, with typically 1.65" (42mm) of accumulated precipitation. In Waimalu, during the entire year, the rain falls for 208.4 days and collects up to 16.5" (419mm) of precipitation.

Ocean temperature

In Waimalu, the average water temperature is 77°F (25°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

With an average of 10.8h of daylight, December has the shortest days of the year.

Sunshine

Months with the least sunshine in Waimalu are November and December, with an average of 6.3h of sunshine.

UV index

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Waimalu. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in December in Waimalu?

The average high-temperature, in December, in Waimalu, is 76.5°F (24.7°C), while the average low-temperature is 70.5°F (21.4°C).

What is the most humid month in Waimalu?

February and December, with an average relative humidity of 76%, are most humid months.

What is the average humidity in December in Waimalu?

In Waimalu, Hawaii, the average relative humidity in December is 76%.

How many days does it rain in December in Waimalu?

In Waimalu, Hawaii, during December, the rain falls for 17 days and regularly aggregates up to 1.65" (42mm) of precipitation.

What is the water temperature in December in Waimalu?

In Waimalu, in December, the average water temperature 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 Waimalu?

With an average of 10.8h of daylight, December has the shortest days of the year in Waimalu, Hawaii.

What is the average length of the day in December in Waimalu?

The average length of the day in December in Waimalu, Hawaii, is 10.8h.

What is the month with the least sunshine in Waimalu?

Months with the least sunshine in Waimalu are November and December, with an average of 6.3h of sunshine.

How long on average sun shines in December in Waimalu?

The average sunshine in December in Waimalu, Hawaii, is 6.3h.

What is the month with the lowest UV index in Waimalu?

Months with the lowest UV index in Waimalu, Hawaii, are January through August, October through December, with an average maximum UV index of 6.

What is the UV index intensity in December in Waimalu?

The average daily maximum UV index in December in Waimalu, Hawaii, is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in December - Waimalu, HI
  • Average high temperature in December: 76.5°F

The warmest months (with the highest average high temperature) are August and September (82°F).
Months with the lowest average high temperature are February and March (75.4°F).

  • Average low temperature in December: 70.5°F

The month with the highest average low temperature is September (75°F).
The coldest month (with the lowest average low temperature) is February (68°F).

Average humidity in December - Waimalu, HI
  • Average humidity in December: 76%

Months with the highest relative humidity are February and December (76%).
Months with the lowest relative humidity are April, May, June and September (74%).

Average rainfall in December - Waimalu, HI
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is July (0.71").

Average rainfall days in December - Waimalu, HI
  • Average rainfall days in December: 17 days

The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is January (13.5 days).

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

The best months for swimming (with the highest average sea temperature) are August, 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 - Waimalu, HI
  • Average daylight in December: 10.8h

The month with the longest days is June (Average daylight: 13.4h).
The month with the shortest days is December (Average daylight: 10.8h).

  • Average sunshine in December: 6.3h

The month with the most sunshine is June (Average sunshine: 9.9h).
Months with the least sunshine are November and December (Average sunshine: 6.3).

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

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