UV Index in San Antonio, Mexico

Last updated: June 2, 2025

In San Antonio, Mexico, staying informed about the UV Index is crucial for maintaining optimal skin health and preventing sunburn, especially in a region characterized by a BSh climate that boasts intense sunlight year-round. As UV levels can soar to a maximum of 12 during peak hours, it’s essential to understand the risks tied to sun exposure, particularly between 10 AM and 4 PM when the sun’s rays are most harmful. By familiarizing yourself with the UV Index, you can take proactive measures to protect your skin, enjoy outdoor activities safely, and minimize potential long-term damage caused by excessive UV exposure.

Hourly UV Index in San Antonio

At dawn, the UV Index starts at a mild 1 at 7:00 AM, gradually climbing as the sun rises. By 9:00 AM, it reaches a modest 2, but as the clock strikes 10:00 AM, the intensity surges to a moderate 5. The sun's power peaks around noon, with a striking 10, and maintains an impressive 12 from 1:00 PM to 2:00 PM. As the afternoon progresses, the index begins to decline, falling back to 10 at 3:00 PM, before tapering off to 5 by 5:00 PM. By evening, the UV Index drops to a comfortable 3 at 6:00 PM and settles back at 1 by 7:00 PM, signaling a safe respite from the sun's relentless rays.

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	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	10	very high	15 min
13:00	12	extreme	10 min
14:00	12	extreme	10 min
15:00	10	very high	15 min
16:00	8	very high	15 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in San Antonio

Throughout the year, UV Index values display significant seasonal variation, with higher risks typically occurring from February to September. The months of April through September highlight an extreme exposure category with a peak UV Index of 12, resulting in a very short burn time of just 10 minutes. Notably, February and March also present high to very high risks, contributing to the overall increase in UV exposure during spring. As we move into the colder months, October to December, UV levels decrease, though November and December still pose moderate risks with burn times of 25 minutes. To ensure safety, visitors and residents are advised to take precautions—wearing sunscreen, protective clothing, and seeking shade during peak hours, especially during the high-risk months of April to September.

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
San Antonio	7	9	10	12	12	12	12	12	11	10	7	6
Guadalajara UVI	9	11	14	14	14	13	13	13	13	12	9	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