UV Index in San Antonio, Mexico

Last updated: June 2, 2025

Understanding the UV Index in San Antonio, Mexico is crucial for safeguarding your skin and overall health from harmful solar radiation. The UV levels fluctuate throughout the day, peaking at a remarkable 14 around noon, making it essential to take preventive measures against sunburn and long-term skin damage. With the city's unique Cwb climate, characterized by moderate temperatures and high UV exposure, residents and visitors alike should remain vigilant. By staying informed about the UV Index, you can enjoy the sunny outdoors without compromising your skin’s well-being.

Hourly UV Index in San Antonio

The UV Index for the day showcases a significant escalation in sun intensity, peaking at 14 between 1 PM and 2 PM. Starting from a safe 0 at 7 AM, it gradually rises to a moderate 1 by 8 AM and hits 2 at 9 AM. As the sun climbs higher, the index jumps to 5 by 10 AM and surges to a robust 12 by noon. The intensity remains strong, holding steady at 14 from 1 PM to 2 PM, before tapering off to 12 at 3 PM and declining further to 6 by 5 PM. As the day winds down, the UV Index drops back to 1 by 7 PM, reminding us to seek shade and protect our skin when the sun's rays are at their strongest.

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	12	extreme	10 min
13:00	14	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