San Juan weather in May 2025

Expect 29°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in San Juan in May. Check more long-term weather averages for San Juan in May before you book your next holiday to Puerto Rico in 2025/2026.

  • 29°C maximum daytime temperature in May in San Juan29
    29°C max day temperature
  • 8 hours of sunshine per day
  • 16 days with some rainfall in May in San Juan16
    16 days with some rainfall
  • 22°C minimum night-time temperature in May in San Juan22
    22°C min night temperature
  • 13 hours of daylight per day in May in San Juan13
    13 hours of daylight per day
  • High heat & humidity in May in San JuanH
    High heat & humidity
  • 182 mm monthly rainfall in May in San Juan182
    182 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in San Juan11
    11+ (Extreme) UV index
  • 27°C sea temperature in May in San Juan27
    27°C sea temperature

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The May 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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More about Puerto Rico

How hot is it in San Juan in May?

Daytime temperatures usually reach 29°C in San Juan in May with high heat and humidity, falling to 22°C at night.

How sunny is it in San Juan in May?

There are normally 8 hours of bright sunshine each day in San Juan in May - that's 63% of daylight hours.

How warm is the sea around San Juan in May?

The average sea temperature around San Juan in May is 27°C.

Does it rain in San Juan in May?

There are usually 16 days with some rain in San Juan in May and the average monthly rainfall is 182mm.

San Juan May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:57 18:46
Friday, 16th May 2025 05:50 18:52
Saturday, 31st May 2025 05:47 18:57

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