UV Index in San Juan, Peru

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors of San Juan, Peru, where sun exposure can pose significant risks to skin health. With a Cfb climate, the region experiences varying UV levels throughout the day; for example, the index peaks at a concerning 13 between 12:00 PM and 1:00 PM. Being aware of these levels is essential for sunburn prevention and maintaining overall skin health, especially during the hotter hours when UV rays are most intense. By staying informed about the UV Index, you can safely enjoy the beautiful outdoors while protecting yourself from harmful sunlight.

Hourly UV Index in San Juan

The UV Index today starts off mild with a maximum of 1 at 7:00 AM, gradually creeping up through the morning. By 9:00 AM, it reaches a notable 5, but the sun really peaks around 12:00 PM when the UV Index hits a scorching 13. It stays dangerously high at 12 until 1:00 PM, before tapering off as the afternoon progresses—9 at 2:00 PM, 6 at 3:00 PM, and then descending to a safer 3 by 4:00 PM. As the day winds down, the index further drops, returning to a comfortable 1 at 5:00 PM and finally settling at 0 by 6:00 PM. Make sure to stay protected during 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	13	extreme	10 min
13:00	12	extreme	10 min
14:00	9	very high	15 min
15:00	6	high	25 min
16:00	3	moderate	30 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 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