Guam weather in December 2019

  • 30°C maximum daytime temperature in December in Guam (Agana)30
    30°C max day temperature
  • 5 hours of sunshine per day
  • 23 days with some rainfall in December in Guam (Agana)23
    23 days with some rainfall
  • 24°C minimum night-time temperature in December in Guam (Agana)24
    24°C min night temperature
  • 11 hours of daylight per day in December in Guam (Agana)11
    11 hours of daylight per day
  • High heat & humidity in December in Guam (Agana)H
    High heat & humidity
  • 150 mm monthly rainfall in December in Guam (Agana)150
    150 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in December in Guam (Agana)9
    9 (Very High) UV index
  • 28°C sea temperature in December in Guam (Agana)28
    28°C sea temperature
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The December weather guide for Guam shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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Metric (°C / mm)  |  Imperial (°F / inches)

Guide to Guam weather in December

The average maximum daytime temperature in Guam in December is a hot 30°C (86°F) with high heat & humidity. The average night-time temperature is usually a warm 24°C (75°F). There are usually 5 hours of bright sunshine each day, which represents 41% of the 11 hours of daylight.

Expect 150mm (5.9 inches) of rainfall across the whole of December with 23 days with some rain falling. Maximum UV levels will be very high (9 UV index) at midday when the skies are clear.

The average sea temperature in and around Guam in December is 28°C (82°F).

The weather in Guam in December is represented by Agana.

Guam sunrise & sunset times for December 2019

Browse the sunrise & sunset times for Guam in December 2019. Select a month to view Guam sunrise & sunset times for the next twelve months. The Guam sunrise & sunset times shown below are for Agana.


Date Sunrise times Sunset times
Sunday, 1st December 2019 06:28 17:52
Monday, 16th December 2019 06:36 17:56
Tuesday, 31st December 2019 06:43 18:04
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