San Juan weather in January 2026

Expect daytime maximum temperatures of 27°C in San Juan, Puerto Rico in January based on long-term weather averages. There are 8 hours of sunshine per day on average with 20 days with some rainfall and typically 116 mm of rainfall in the month.

  • 27°C maximum daytime temperature in January in San Juan27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 20 days with some rainfall in January in San Juan20
    20 days with some rainfall
  • 20°C minimum night-time temperature in January in San Juan20
    20°C 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
  • 116 mm monthly rainfall in January in San Juan116
    116 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in January in San Juan8
    8 (Very High) UV index
  • 26°C sea temperature in January in San Juan26
    26°C sea temperature

More about San Juan

San Juan by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Puerto Rico

Marella Cruises: up to 4% off ocean cruises

  • Book online & save up to 4% on Marella Cruises
  • Discount varies by season. Book online with TUI
  • Destinations across the Med, Caribbean & USA
Go to Marella Cruises deal >>

View all Marella Cruises offers

Marella CruisesCruise deal finder

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 / mm)  |  Imperial (°F / inches)

Back to top

More about Puerto Rico

How hot is it in San Juan in January?

Daytime temperatures usually reach 27°C in San Juan in January with moderate heat and humidity, falling to 20°C 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 26°C.

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 116mm.

San Juan January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 06:57 18:00
Friday, 16th January 2026 07:00 18:09
Saturday, 31st January 2026 06:58 18:18

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^