San Juan, Puerto Rico UV Index
San Juan UV index today — burn time, EPA scale, and sun-protection guidance
San Juan, PR · UV Index right now
Fair-to-medium skin (type III) burns in ~29 min
UV 7HighObserved 10:06 AM AST
A UV index of 7 means unprotected skin can begin to burn in roughly 19 minutes for the most sun-sensitive skin (Fitzpatrick type I) and about 29 minutes for fair-to-medium skin (type III).
Peak UV today: 10:17 AM–2:17 PM
Estimated from today’s sunrise and sunset: UV is strongest in the two hours either side of solar noon (12:17 PM local time).
EPA UV Index scale
Current reading: UV 7 — High.
Sun protection right now
- SPF & cover-up
- Wear SPF 30+ broad-spectrum sunscreen, reduce midday sun (10 a.m.–4 p.m.), and cover up.
- Reapply
- Reapply every two hours and after swimming or heavy sweating.
- Safe exposure
- Unprotected fair-to-medium (Fitzpatrick III) skin can begin to burn in about 29 minutes at this UV level. Sunscreen, shade, and cover-up extend that window.
EPA / WHO sun-safety guidance; type III skin baseline. Current band: High.
Burn time by skin type
The current UV index is 7 (High) — unprotected skin can begin to redden fastest for the fairest (Fitzpatrick type I) skin and slowest for the darkest (type VI).
See the full minutes-to-burn table for every UV level and all six skin types in the sunburn-time guide.
Sun protection for today's UV
- EltaMD UV Clear SPF 46 Face Sunscreen
Broad-spectrum mineral-chemical face sunscreen. Lightweight, non-greasy — the dermatologist standby for daily high-UV exposure.
- La Roche-Posay Anthelios SPF 60 Body Sunscreen
Broad-spectrum SPF 60 for arms, shoulders, and legs. Water-resistant for 80 minutes — reapply after swimming or heavy sweat.
- Coolibar UPF 50+ Long-Sleeve Swim Shirt
UPF 50+ rash guard blocks ~98% of UV. A physical layer outperforms any sunscreen on the skin it covers — no reapplication needed.
- Wallaroo UPF 50+ Wide-Brim Sun Hat
A 3-inch+ brim shades the face, ears, and neck — the spots people forget to re-apply sunscreen and where most skin cancers start.
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UV through the year in San Juan
Near the tropics the sun rides high all year, so UV in San Juan stays strong across most months and tops out in May, when the estimated clear-sky peak UV index reaches about 13 around solar noon. At that peak the noon sun reaches about 89° above the horizon. Each month below pairs the noon sun elevation with the estimated peak UV and how fast unprotected skin can begin to redden.
| Month | Noon sunelevation | Peak UVclear-sky est. | Type Imin to burn | Type IIImin to burn | Type VImin to burn |
|---|---|---|---|---|---|
| January | 50° | 7 | 19 | 29 | 95 |
| February | 59° | 9 | 15 | 22 | 74 |
| March | 69° | 11 | 12 | 18 | 61 |
| April | 81° | 12 | 11 | 17 | 56 |
| May | 89° | 13 | 10 | 15 | 51 |
| June | 85° | 12 | 11 | 17 | 56 |
| July | 87° | 12 | 11 | 17 | 56 |
| August | 86° | 12 | 11 | 17 | 56 |
| September | 75° | 11 | 12 | 18 | 61 |
| October | 63° | 9 | 15 | 22 | 74 |
| November | 53° | 7 | 19 | 29 | 95 |
| December | 48° | 6 | 22 | 33 | 111 |
Clear-sky estimate from sun angle and elevation — day-to-day clouds and ozone shift the real index up or down. Burn times are first-redness approximations for unprotected skin, not a safe-exposure budget.
Frequently asked
- When is UV strongest in San Juan?
- Around May, when San Juan's estimated clear-sky UV index peaks near 13 at solar noon. It is weakest around December, near 6. These are clear-sky estimates from the sun's angle and the city's elevation; clouds and ozone move the daily reading.
- How fast can you get sunburned in San Juan?
- At the May clear-sky peak (UV 13), unprotected fair-to-medium skin (Fitzpatrick type III) can begin to burn in about 15 minutes, and the most sun-sensitive skin (type I) in about 10. In December (UV 6), type III skin takes about 33 minutes to begin burning and type I about 22.
UV & sun-safety guides
See how the UV Index works — including why clouds are no shield — plus evergreen guides to burn time, vitamin D, skin-cancer risk, and when UV is strongest, collected on the UV Index hub.