UV Index in San Juan, Peru

Last updated: June 2, 2025

In San Juan, Peru, understanding the UV Index is crucial for maintaining skin health and preventing sunburn. With the region's arid BWk climate, residents and visitors alike should be aware of the potential risks associated with high UV exposure. Typically peaking around noon with an index level of 9, it’s essential to know when to seek shade or apply sunscreen to protect against harmful effects. By staying informed about UV levels, you can enjoy the sun safely while preserving your skin’s health.

Hourly UV Index in San Juan

The UV Index data for today reveals a steady climb in ultraviolet exposure as the sun rises. Starting at a mild 1 at 07:00, the index escalates to 2 by 08:00, before witnessing a significant jump to 4 at 09:00. The peak occurs around 12:00, where it reaches 9—a strong signal to take protective measures against sun damage. After this midday high, the UV Index begins to drop, descending to 6 at 14:00, before dwindling further to 3 by 15:00. The evening hours bring a dramatic decline, with 1 at 16:00 and tapering off to 0 by 19:00. This data highlights the importance of sun safety during peak hours, particularly between 11:00 and 13:00.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:002low45 min
09:004moderate30 min
10:006high25 min
11:008very high15 min
12:009very high15 min
13:008very high15 min
14:006high25 min
15:003moderate30 min
16:001low45 min
17:001low45 min
18:000low45 min
19:000low45 min

Monthly UV Index Trends in San Juan

Throughout the year, UV index levels show significant seasonal variation, with extreme exposure categories prevalent from January to April and again in August and November. The highest-risk months for UV exposure are January, February, and November — all with a UV index of 15 and a burn time of just 10 minutes. From March to April, the index remains high but slightly decreases to 14 and 13, respectively. Visitors and residents are strongly advised to take precautions during these critical months, including wearing protective clothing, seeking shade, and applying high SPF sunscreen to reduce the risk of sunburn and long-term skin damage. In contrast, from May through July, while the UV index remains high, exposure risks lessen slightly, with burn times extending to 15 minutes. However, vigilance is still necessary, especially during peak sunlight hours.

Monthly Maximum UV Index for San Juan, Peru

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in San Juan. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec1515141310991113141515
Data source: Statistical UV Index data for San Juan, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare San Juan UV Index with Other Peru Cities

The table above highlights how UV exposure in San Juan compares to other major locations across Peru. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
San Juan's solar exposure compared to other cities in Peru. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Callao UVI14141412109101112131413
Lima UVI14141412109101112131413
San Juan1515141310991113141515
Trujillo UVI151515141211111113141414
Chiclayo UVI141515141311111215141413
Arequipa UVI181717151210111315171817