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

Entering December, the average high-temperature is recorded at a still moderately hot 78.8°F (26°C), exhibiting a minimal shift from November's 80.6°F (27°C). Halawa experiences a mean low-temperature of 62.6°F (17°C) during December.

Rainfall

In Halawa, during December, the rain falls for 12 days and regularly aggregates up to 6.54" (166mm) of precipitation. Throughout the year, in Halawa, there are 116 rainfall days, and 54.96" (1396mm) of precipitation is accumulated.

Ocean temperature

In Halawa, the average seawater temperature in December is 77°F (25°C).
Note: Water temperature from 77°F (25°C) to 84.2°F (29°C) is considered very warm, making water activities enjoyable for prolonged periods without any uncomfortable sensations.

Daylight

With an average of 10h and 54min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:48 am and sunset at 5:44 pm. On the last day of the month, 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 in Halawa.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 6 in December converts into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Notice! The reflection of water and sand increases the UV radiation significantly.