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Weather in December in San Juan

Puerto Rico   flag
< December >
 
Normal Max/ High Temperature 28°C (82°F)
 
Average Temperature 25°C (76°F)
 
Min/ Low Temperature 21°C (70°F)
Average Sea or Water Temp 27°C(81°F)
 
Normal Precipitation 138mm (5.4in)
Number of Wet Days (probability of rain on a day) 19 (61%)
Average Sunlight per day 06:30
Average Daylight per day 11:01
Sunny (Cloudy) Daylight Hours 60% (40%)
Sun altitude at solar noon on the 21st day.
48.1°


  • The average sea tempeature is 27 °C (80.6 °F).
  • The average temperature in San Juan in December is fairly hot at 24.5 °C (76.1 °F).
  • Afternoons can be very hot with average high temperatures reaching 28 °C (82.4 °F).
  • Overnight temperatures are generally warm with an average low of 21 °C (69.8 °F).
  • The mean diurnal temperature variation/ range in December is 7 °C (12.6 °F).
  • The weather in December is far from dry with rain from time to time. Some 138mm (5.4in) of H2O is released during an average of 19 days.
  • In December the heavens above San Juan are fine having on average a detectable 6:30 of magnificent sunshine daily.
  • The shortest day is 11:00 long and the longest day is 11:04 long with an average length of 11:01.
  • There are approximately 4:23 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 59.7% of daylight hours and cloudy 40.3% of daylight hours.

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Weather Trend Graph for December in San Juan, Puerto Rico

Graph of weather in San Juan in December

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