Guam, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Hagåtña, GU

The perfect water temperature of 83.1°F (28.4°C) makes December a great period for swimming and other water activities in Hagåtña, Guam.

Ocean temperature

In Hagåtña, the average water temperature is 83.1°F (28.4°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.


With an average of 11.3h of daylight, December has the shortest days of the year in Hagåtña.

How warm is the water in December in Hagåtña?

In Hagåtña, the average seawater temperature in December is 83.1°F (28.4°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 Hagåtña?

The month with the shortest days in Hagåtña, Guam, is December, with an average of 11.3h of daylight.

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

The average length of the day in December in Hagåtña, Guam, is 11.3h.
Average sea temperature in December - Hagåtña, GU
  • Average sea temperature in December: 83.2°F

The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).

Average daylight in December - Hagåtña, GU
  • Average daylight in December: 11.3h

The month with the longest days is June (Average daylight: 12.9h).
The month with shortest days is December (Average daylight: 11.3h).