San Juan weather in December 2026

Expect daytime maximum temperatures of 28°C in San Juan, Puerto Rico in December based on long-term weather averages. There are 7 hours of sunshine per day on average with 21 days with some rainfall and typically 151 mm of rainfall in the month.

• 28
  28°C max day temperature
• 7
  7 hours of sunshine per day
• 21
  21 days with some rainfall
• 21
  21°C min night temperature
• 11
  11 hours of daylight per day
• M
  Moderate heat & humidity
• 151
  151 mm of monthly rainfall
• 8
  8 (Very High) UV index
• 27
  27°C sea temperature

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The December weather guide for Puerto Rico (San Juan) 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)

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San Juan December sunrise & sunset times

Browse the sunrise and sunset times for San Juan in December 2026. Select a month to view San Juan sunrise and sunset times for the next 12 months.

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