Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 28.2 °C | 27 °C | 14 days | Possible, with trade-offs |
| February | 28.2 °C | 26.7 °C | 15 days | Possible, with trade-offs |
| March | 28.8 °C | 26.6 °C | 15 days | Possible, with trade-offs |
| April | 29.6 °C | 27 °C | 16 days | Possible, with trade-offs |
| May | 30.8 °C | 27.6 °C | 17 days | Possible, with trade-offs |
| June | 31.5 °C | 28.3 °C | 17 days | Possible, with trade-offs |
| July | 31.2 °C | 28.6 °C | 19 days | Unfavourable season |
| August | 31.2 °C | 29 °C | 19 days | Unfavourable season |
| September | 31.1 °C | 29.4 °C | 22 days | Unfavourable season |
| October | 30.5 °C | 29.4 °C | 22 days | Unfavourable season |
| November | 29.2 °C | 28.7 °C | 20 days | Unfavourable season |
| December | 28.4 °C | 27.9 °C | 18 days | Possible, with trade-offs |
Nearby in May
Before you go
Three things to check once you have picked your dates.
Entry
No visa, but an electronic travel authorisation (ESTA) must be obtained online before departure. Passport valid until your return date. FCDO page for the USA: ESTA (with selfie photo) or visa before travel; not eligible after travel to Cuba since 12 January 2021 or to listed countries.
For a British passport, per the UK Foreign Office on 18 August 2026. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 18 August 2026
Health
Vaccines · hepatitis A and hepatitis B if you are not already vaccinated. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. No entry requirement.
Malaria · None.
Mosquitoes · dengue and Zika reported: protect yourself from bites.
Per the CDC (page reviewed 25 August 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in San Juan in May?
The sea averages 27.6°C in May — yes, pleasant swimming.
How hot is San Juan in May?
Expect 30.8°C in the afternoon and 23.8°C at night, averaged over the last 10 years.
Does it rain a lot in San Juan in May?
Around 17 days with rain (≥ 1 mm) in the month — 56% of days.