UV Index in San Antonio, Mexico

Last updated: July 2, 2025

Understanding the UV Index in San Antonio, Mexico is crucial for safeguarding your skin health and preventing sunburns, especially given the region’s prevalent high UV levels. With a climate classified as Cwb, residents and visitors alike experience significant sun exposure throughout the year, particularly between 11:00 AM and 2:00 PM, when UV levels can peak at an intense 14. Being aware of these ultraviolet risks helps you take proactive measures, whether it’s applying sunscreen or seeking shade, ensuring you enjoy the sunny days while protecting your skin from harmful effects.

Hourly UV Index in San Antonio

As the day unfolds, the UV Index rises dramatically, beginning with a gentle 0 at 07:00. By 09:00, it reaches a modest 2, but the real intensity kicks in as the sun climbs higher. At 11:00, the index peaks at an impressive 8, and then skyrockets to a maximum of 14 by 14:00. This mid-afternoon zenith signals a critical time for sun safety, with both 12:00 and 13:00 hovering at 11 and 13, respectively. As evening approaches, the UV exposure begins to wane, descending to a comfortable 6 at 17:00, before tapering off to a mere 1 by 19:00. Enjoy the sun, but remember to protect yourself 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	0	low	45 min
08:00	1	low	45 min
09:00	2	low	45 min
10:00	4	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	9	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 Antonio

The seasonal variations in UV Index demonstrate a significant rise during the spring and summer months, peaking in April through September with an extreme index of 14 to 15. February through October also reflect high-risk UV conditions, with the most intense exposure occurring from March to October. During these months, the burn time is notably brief, ranging from 10 minutes, emphasizing the need for caution. Residents and visitors should ensure they apply broad-spectrum sunscreen, wear protective clothing, and seek shade during peak hours to minimize the risk of sunburn and long-term skin damage. Notably, November and December see a slight decrease in UV levels, but vigilance is still essential as the index remains within the very high category.

Monthly Maximum UV Index for San Antonio, Mexico

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in San Antonio. 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 Antonio, 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 Antonio UV Index with Other Mexico Cities

The table above highlights how UV exposure in San Antonio 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 Antonio'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 Antonio	10	11	14	15	14	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