UV Index in San Juan, Mexico

Last updated: June 2, 2025

In San Juan, Mexico, understanding the UV Index is crucial for safeguarding your skin under the sun. With elevated UV levels peaking at an intensity of 14 during midday, awareness is your first line of defense against sunburn and long-term skin health issues. San Juan’s arid climate invites outdoor activities year-round, but the risk posed by UV exposure during the sunniest hours—especially between 11 AM and 3 PM—cannot be overlooked. By staying informed about the UV forecast, you can enjoy San Juan’s beautiful weather while protecting your skin from harmful effects.

Hourly UV Index in San Juan

The UV Index for the day paints a vivid picture of solar intensity. Starting off at 0 at 07:00, the sun gradually warms up, hitting 2 by 09:00. As the clock strikes 10:00, the index surges to a notable 5, marking the beginning of peak sun exposure. Things heat up significantly by 11:00, peaking at an impressive 14 by 14:00—the zenith of UV intensity. After this, a gentle decline begins, with the index easing to 12 at 15:00 and tapering off to 6 by 17:00. As the day winds down, the UV Index further drops to 3 by 18:00 and concludes with a 1 at 19:00—a gentle reminder to enjoy the sun wisely!

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	0	low	45 min
08:00	1	low	45 min
09:00	2	low	45 min
10:00	5	moderate	30 min
11:00	8	very high	15 min
12:00	11	extreme	10 min
13:00	13	extreme	10 min
14:00	14	extreme	10 min
15:00	12	extreme	10 min
16:00	10	very high	15 min
17:00	6	high	25 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in San Juan

The UV Index exhibits significant seasonal variability, peaking between March and October, where the levels frequently remain in the extreme category. The highest UV Index occurs in May at 15, indicating a burn time of just 10 minutes. The months from February to October are particularly high-risk, with March through October consistently showing extreme exposure. During these months, it’s crucial for visitors and residents to take precautions, such as wearing broad-spectrum sunscreen and protective clothing, and seeking shade during peak sun hours. Conversely, November and December see a slight reduction in risk, with a UV Index of 10 and 8 respectively, though caution is still advised due to the very high exposure levels.

Monthly Maximum UV Index for San Juan, Mexico

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 Mexico Cities

The table above highlights how UV exposure in San Juan compares to other major locations across Mexico. 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 Mexico. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Guadalajara UVI	9	11	14	14	14	13	13	13	13	12	9	8
San Juan	8	11	13	14	15	14	14	14	14	12	10	8
Iztapalapa UVI	10	12	14	15	14	14	14	14	14	12	10	8
Ecatepec de Morelos UVI	10	12	14	15	15	14	14	13	14	12	10	8
Mexico City UVI	10	12	14	15	15	14	14	13	14	12	10	8
Puebla UVI	10	12	14	15	15	15	15	14	14	13	10	9