December weather forecast
Halawa, HI

December, the final month of the year, solidifies the cooling trend in Halawa, lowering the temperature range to between 63°F (17.2°C) and 79°F (26.1°C). The precipitation hits an annual high, recording 6.5" (165mm) over 12 rainy days. The decrease in daylight duration becomes truly noticeable, finishing shy of 11 hours. The UV index recedes to the lowest of the year, significantly reducing the threat of sun exposure. Despite this, the sea temperature remains welcoming, rounding off a year of good surf in Halawa, Hawaii.

Temperature

Halawa's weather, upon December's arrival, documents an average high-temperature of a still moderately hot 78.8°F (26°C), nearly identical to the prior month. During December, the temperature in Halawa is averaged to a low of 62.6°F (17°C) at night.

Rainfall

In Halawa, in December, it is raining for 12 days, with typically 6.54" (166mm) of accumulated precipitation. In Halawa, Hawaii, during the entire year, the rain falls for 116 days and collects up to 54.96" (1396mm) of precipitation.

Ocean temperature

In Halawa, Hawaii, the average seawater temperature in December is 77°F (25°C).
Note: Water activities in surface temperatures between 77°F (25°C) and 84.2°F (29°C) are seen as exceptional and extremely agreeable for lengthened time spans.

Daylight

The month with the shortest days in Halawa is December, with an average of 10h and 54min of daylight.
On the first day of the month, sunrise is at 6:48 am and sunset at 5:44 pm. On the last day of December, sunrise is at 7:04 am and sunset at 5:56 pm HST.

Sunshine

January, February, November and December, with an average of 7h of sunshine, are months with the least sunshine.

UV index

The month with the lowest UV index in Halawa is December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: A daily maximum UV index of 6 in December translates into the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. 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. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take heed! Reflections of sand and water make the Sun's UV rays stronger.