December weather forecastHonolulu, HI
December
Weather in December
December is a month of contrast in weather for Honolulu. Cooler than previous months, the minimum temperature drops to 71.4°F (21.9°C). Yet, the landscape remains lush thanks to a sizable 1.54" (39mm) of rainfall. Even though daylight hours are at their shortest, weather conditions still allow for encouraging beach activities. As the month concludes, the overall weather in December meshes a cooler tropical environment with vibrant Hawaiian charm making it a unique month for experiencing Honolulu.Temperature
The arrival of December brings an average high-temperature of a still warm 76.5°F (24.7°C), closely following the temperature pattern of November. December nights reflect a consistent temperature dip to a pleasant 71.4°F (21.9°C), a slight descent from daytime peaks.Humidity
February and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In Honolulu, Hawaii, during December, the rain falls for 15.7 days and regularly aggregates up to 1.54" (39mm) of precipitation. In Honolulu, during the entire year, the rain falls for 197.2 days and collects up to 14.61" (371mm) of precipitation.Ocean temperature
In December, the average ocean temperature is 77°F (25°C).Note: Surface water temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are considered superb and highly pleasant for water activities over extended periods.
Daylight
The month with the shortest days in Honolulu is December, with an average of 10h and 54min of daylight.On the first day of December, sunrise is at 6:53 am and sunset at 5:48 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:00 pm HST.
Sunshine
The months with the least sunshine are November and December, with an average of 6.5h of sunshine.UV index
January through June, 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 risk from exposure to the Sun's UV rays for average individuals.Note: A typical high UV index of 6 in December suggests the following recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Honolulu, HI
- Average high temperature in December: 76.5°F
The warmest month (with the highest average high temperature) is September (81.5°F).
The months with the lowest average high temperature are February and March (75°F).
- Average low temperature in December: 71.4°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).
Average pressure in December
Honolulu, HI
- Average pressure in December: 30"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in December
Honolulu, HI
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).
Average humidity in December
Honolulu, HI
- Average humidity in December: 76%
The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are April, May, September and November (74%).
Average rainfall in December
Honolulu, HI
- Average rainfall in December: 1.54"
The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in December
Honolulu, HI
- Average rainfall days in December: 15.7 days
The months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).
Average sea temperature in December
Honolulu, HI
- Average sea temperature in December: 77°F
The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight in December /
Average sunshine in December
Honolulu, HI
- Average daylight in December: 10h and 54min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in December: 6h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are November and December (Average sunshine: 6h and 30min).
Average sunshine days in December
Honolulu, HI
- Average sunshine days in December: 9.6 days
The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).
Average UV index in December
Honolulu, HI
- Average UV index in December: 6
The months with the highest UV index are July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, October, November and December (UV index 6).
Average cloud cover in December
Honolulu, HI
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 40).
The months with the least cloud cover are January and September (Cloud cover 33).
Average visibility in December
Honolulu, 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).
