UV Index in San Juan, Peru

Last updated: July 2, 2025

Understanding the UV Index is crucial for the residents and visitors of San Juan, Peru, where the sun shines brightly in a Cfb climate. Knowing the daily UV levels can significantly impact your health by helping to prevent sunburn and protect your skin from harmful rays. With peak UV exposure often reaching a staggering 14 around noon, being aware of these levels is essential for enjoying outdoor activities safely. Whether you're soaking in the sun or simply running errands, understanding how to manage UV exposure is key to maintaining skin health in this beautiful city.

Hourly UV Index in San Juan

As the sun rises, the UV Index begins its ascent, starting at a modest 1 at 07:00. It gains momentum steadily, reaching an impressive 5 by 09:00. By 10:00, the intensity skyrockets to 9, and from 11:00 to 12:00, it hits peak levels of 12 and 14, respectively, making these hours the most dangerous for unprotected skin. A slight decline follows in the afternoon, with readings of 13 at 13:00 and 10 by 14:00, before tapering off to 7 at 15:00. As the day winds down, UV levels drop significantly, falling to 3 at 16:00, and finally settling back to 1 by 17:00 through 18:00, before fading to 0 by 19:00. It's essential to stay sun-safe during those peak hours!

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	2	low	45 min
09:00	5	moderate	30 min
10:00	9	very high	15 min
11:00	12	extreme	10 min
12:00	14	extreme	10 min
13:00	13	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in San Juan

The seasonal UV Index exhibits extreme levels throughout the year, with the highest values occurring from January to April, peaking at 19 in March. These months are characterized by a consistent burn time of just 10 minutes, indicating a high risk for sunburn. While May through October show a slight decrease in UV Index values, all months remain in the extreme exposure category, particularly September and October when the UV Index returns to 17 and 18, respectively. Residents and visitors should take caution during these high-risk months by limiting sun exposure, wearing protective clothing, and applying sunscreen regularly, as the potential for skin damage remains significant throughout the year.

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
Arequipa UVI	18	17	17	15	12	10	11	13	15	17	18	17
San Juan	17	18	19	18	15	13	14	14	17	18	16	16