San Juan weather in January 2025

Expect 81°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in San Juan in January. Check more long-term weather averages for San Juan in January before you book your next holiday to Puerto Rico in 2025/2026.

  • 81°F maximum daytime temperature in January in San Juan81
    81°F max day temperature
  • 8 hours of sunshine per day
  • 20 days with some rainfall in January in San Juan20
    20 days with some rainfall
  • 68°F minimum night-time temperature in January in San Juan68
    68°F min night temperature
  • 11 hours of daylight per day in January in San Juan11
    11 hours of daylight per day
  • Moderate heat & humidity in January in San JuanM
    Moderate heat & humidity
  • 4.6 inches monthly rainfall in January in San Juan4.6
    4.6 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in January in San Juan8
    8 (Very High) UV index
  • 79°F sea temperature in January in San Juan79
    79°F sea temperature

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The January 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)  |  Imperial (°F)

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More about Puerto Rico

How hot is it in San Juan in January?

Daytime temperatures usually reach 81°F in San Juan in January with moderate heat and humidity, falling to 68°F at night.

How sunny is it in San Juan in January?

There are normally 8 hours of bright sunshine each day in San Juan in January - that's 69% of daylight hours.

How warm is the sea around San Juan in January?

The average sea temperature around San Juan in January is 79°F.

Does it rain in San Juan in January?

There are usually 20 days with some rain in San Juan in January and the average monthly rainfall is 4.6 inches.

San Juan January sunrise & sunset times

Browse the sunrise and sunset times for San Juan in January 2025. Select a month to view San Juan sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st January 2025 06:57 18:00
Thursday, 16th January 2025 07:00 18:09
Friday, 31st January 2025 06:58 18:18

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