UV Index in San Juan, Peru

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in San Juan, Peru, as it provides essential information about the intensity of ultraviolet radiation from the sun. By monitoring UV levels, you can effectively prevent sunburn and protect your skin health, reducing the risk of long-term damage. Situated in an Af climate zone, San Juan experiences high UV exposure, particularly during midday hours when the index can reach up to 11. Awareness of these levels helps you enjoy the beautiful outdoors while staying safe under the sun!

Hourly UV Index in San Juan

At dawn, the UV Index begins at a gentle 1, but as the sun ascends, it rapidly intensifies. By 09:00, it reaches 5, marking the onset of midday sun. The peak is noted at 11:00 and 12:00, with an impressive 11, indicating a high risk of harm from unprotected sun exposure. As the afternoon unfolds, the index slowly declines; by 15:00, it drops to 5, and you can find some relief by 16:00 with a further decrease to 2. By the time evening sets in, the UV Index dwindles to 0, safely signaling the end of sun exposure concerns for the day. Remember to protect your skin during those crucial midday 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	8	very high	15 min
11:00	11	extreme	10 min
12:00	11	extreme	10 min
13:00	10	very high	15 min
14:00	8	very high	15 min
15:00	5	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