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UV Index in Puerto Rico

Live UV forecast for 21 cities

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UV climate of Puerto Rico: overview

Puerto Rico stretches from 17.9841° to 18.4725° latitude (Northern hemisphere), so UV conditions differ a lot from region to region. The clear-sky UV index reaches ≈ 9.5 in Cayey (peak in May), while in Vega Baja the yearly maximum is only ≈ 9.4.

UV index by month by climate zone

ZoneCitiesJFMAMJJASONDPeak
Tropical21 7 7.8 8.7 9.3 9.4 9.4 9.4 9.4 9.1 8.4 7.5 6.9 9.4

Calculated clear-sky noon peaks at the average latitude of each zone. Real values vary with clouds, altitude and ozone.

Sunniest cities in Puerto Rico (highest UV)

Cayey · 9.5 in May Guayama · 9.5 in May Ponce · 9.5 in May Yauco · 9.5 in May Aguadilla · 9.4 in May

Cities with the mildest sun

Vega Baja · max 9.4 Trujillo Alto · max 9.4 San Juan · max 9.4 Mayagueez · max 9.4 Manati · max 9.4

When do you need SPF in Puerto Rico?

Using San Juan as a reference: the UV index reaches 6+ in January, February, March, April, May, June, July, August, September, October, November and December. In the sunniest zones (see table) SPF 30–50+ is needed almost year-round; in the mildest — only in late spring and summer.

FAQ: UV index in Puerto Rico

What is the highest UV index in Puerto Rico?

The calculated clear-sky maximum is ≈ 9.5 — in Cayey around May. Values above this occur only near the equator and in high mountains.

Which city in Puerto Rico is the sunniest?

Cayey (peak ≈ 9.5), followed by Guayama and Ponce. The mildest sun is in Vega Baja (max ≈ 9.4).

When is SPF needed in Puerto Rico?

In San Juan and similar latitudes the UV reaches 6+ in January, February, March, April, May, June, July, August, September, October, November and December: use SPF 30–50+ on sunny days. Protection is advised from UV 3.

Is UV 11+ possible in Puerto Rico?

No — the local maximum is ≈ 9.5. UV 11+ occurs only near the equator, in deserts and high mountains.