Weather in San Juan in December 2018

  • 28°C maximum daytime temperature in December in San Juan28
    28°C max day temperature
  • 7 hours of sunshine per day (63% of daylight hours) in December in San Juan7
    7 hours of sunshine per day
  • 21 days with some rainfall in December in San Juan21
    21 days with some rainfall
  • 21°C minimum night-time temperature in December in San Juan21
    21°C min night temperature
  • 11 hours of daylight per day in December in San Juan11
    11 hours of daylight per day
  • Moderate heat & humidity in December in San JuanM
    Moderate heat & humidity
  • 151 mm monthly rainfall in December in San Juan151
    151 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in December in San Juan8
    8 (Very High) UV index
  • 27°C sea temperature in December in San Juan27
    27°C sea temperature

Going to San Juan? Find the best month to visit San Juan based on the weather.

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Expect 28°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in San Juan in December. Check more long-term weather averages for San Juan in December before you book your next holiday to Puerto Rico in 2018/2019.

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More about San Juan

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The December weather guide for San Juan, Puerto Rico 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.

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

Guide to San Juan weather in December

The average maximum daytime temperature in San Juan in December is a warm 28°C (82°F) with moderate heat & humidity. The average night-time temperature is usually a comfortable 21°C (70°F). There are usually 7 hours of bright sunshine each day, which represents 63% of the 11 hours of daylight.

Expect 151mm (5.9 inches) of rainfall across the whole of December with 21 days with some rain falling. Maximum UV levels will be very high (8 UV index) at midday when the skies are clear.

The average sea temperature in and around San Juan in December is 27°C (81°F).

San Juan sunrise & sunset times for December 2018

Browse the sunrise & sunset times for San Juan in December 2018. Select a month to view San Juan sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Saturday, 1st December 2018 06:40 17:47
Sunday, 2nd December 2018 06:41 17:47
Monday, 3rd December 2018 06:42 17:47
Tuesday, 4th December 2018 06:42 17:47
Wednesday, 5th December 2018 06:43 17:47
Thursday, 6th December 2018 06:43 17:48
Friday, 7th December 2018 06:44 17:48
Saturday, 8th December 2018 06:45 17:48
Sunday, 9th December 2018 06:45 17:48
Monday, 10th December 2018 06:46 17:49
Tuesday, 11th December 2018 06:46 17:49
Wednesday, 12th December 2018 06:47 17:49
Thursday, 13th December 2018 06:48 17:50
Friday, 14th December 2018 06:48 17:50
Saturday, 15th December 2018 06:49 17:51
Sunday, 16th December 2018 06:49 17:51
Monday, 17th December 2018 06:50 17:51
Tuesday, 18th December 2018 06:50 17:52
Wednesday, 19th December 2018 06:51 17:52
Thursday, 20th December 2018 06:51 17:53
Friday, 21st December 2018 06:52 17:53
Saturday, 22nd December 2018 06:52 17:54
Sunday, 23rd December 2018 06:53 17:54
Monday, 24th December 2018 06:53 17:55
Tuesday, 25th December 2018 06:54 17:55
Wednesday, 26th December 2018 06:54 17:56
Thursday, 27th December 2018 06:55 17:56
Friday, 28th December 2018 06:55 17:57
Saturday, 29th December 2018 06:55 17:58
Sunday, 30th December 2018 06:56 17:58
Monday, 31st December 2018 06:56 17:59
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