UV Index in San Juan, Peru

Last updated: June 2, 2025

In San Juan, Peru, understanding the UV Index is crucial for safeguarding your skin and overall health. As the sun's rays can be particularly intense, especially during peak hours, knowing the UV levels can help you prevent sunburn and long-term skin damage. The region's typical Af climate contributes to elevated UV exposure, with values reaching as high as 12 around midday. By staying informed about the UV Index, you can take proactive measures to enjoy the beautiful weather while keeping your skin protected.

Hourly UV Index in San Juan

Today’s UV Index reveals a striking pattern of solar intensity throughout the day. The morning begins gently at 7:00 AM with a low index of 1, gradually climbing to 3 by 8:00 AM. As the sun rises higher, the index peaks at a blazing 12 at noon, signaling the hour of greatest sun exposure. Throughout the early afternoon, UV levels remain high at 11 before starting their descent after 2:00 PM, dropping to 4 by 3:00 PM. By late afternoon, the index dwindles to a safe 1 by 5:00 PM, and the sun sets, leaving us with a calming 0 from 6:00 PM onward. It’s important to stay protected during those hours of maximum UV intensity!

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.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	3	moderate	30 min
09:00	6	high	25 min
10:00	9	very high	15 min
11:00	11	extreme	10 min
12:00	12	extreme	10 min
13:00	11	extreme	10 min
14:00	8	very high	15 min
15:00	4	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	0	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in San Juan

The UV Index experiences its highest values from January to April, peaking at 17 in March, which signifies extreme exposure risks for skin and eyes. The burn time during these months is a mere 10 minutes, making it crucial for visitors and residents to take protective measures, such as wearing sunscreen, sunglasses, and protective clothing. Although the UV Index slightly decreases during the summer months, it remains in the extreme category from May to August, maintaining a burn time of 10 minutes. September, October, and November see a slight decline, yet the UV Index still holds at levels that require caution. Therefore, throughout the year, but particularly from January to April, it is essential for everyone to stay informed and proactive in sun protection strategies to mitigate the risks associated with high UV exposure.

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.

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.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Callao UVI	14	14	14	12	10	9	10	11	12	13	14	13
Lima UVI	14	14	14	12	10	9	10	11	12	13	14	13
Trujillo UVI	15	15	15	14	12	11	11	11	13	14	14	14
Chiclayo UVI	14	15	15	14	13	11	11	12	15	14	14	13
San Juan	15	16	17	16	13	12	11	12	13	14	13	13
Arequipa UVI	18	17	17	15	12	10	11	13	15	17	18	17