UV Index in San Antonio, Mexico

Last updated: June 2, 2025

Understanding the UV Index is essential for residents and visitors in San Antonio, Mexico, where the sun’s rays can impact skin health dramatically. With the region's Cwa climate, characterized by warm summers and mild winters, knowing the daily UV levels is crucial for preventing sunburn and long-term skin damage. Particularly between 11 AM and 2 PM, when UV levels soar to a high of 13, it becomes vital to take protective measures. Stay informed and protect your skin by regularly checking the UV Index, ensuring a healthy and enjoyable outdoor experience in this vibrant city.

Hourly UV Index in San Antonio

At 07:00 and 08:00, the UV Index remains low, peaking at 1, making it a safe time for outdoor activities. However, as the day progresses, the sun’s intensity ramps up sharply. By 10:00, the index reaches 5, climbing to a striking 11 by noon. The day hits its peak at 13:00 and 14:00, with a UV Index of 13, warranting caution and sun protection. As the afternoon unfolds, you’ll find a gradual decline: readings drop to 11 at 15:00, then 8 at 16:00, further easing to 2 by 18:00, and finally settling back to 1 by 19:00. Remember, to enjoy the sun safely, consider protective measures during the high UV 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	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	13	extreme	10 min
15:00	11	extreme	10 min
16:00	8	very high	15 min
17:00	5	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in San Antonio

Throughout the year, UV exposure levels show significant variation, with the highest UV Index readings occurring from March to October, indicating extreme conditions and particularly high-risk months for sunburn. The peak UV Index reaches 13 during April, June, July, August, and September, where the burn time is as short as 10 minutes. In contrast, January, November, and December present high to very high exposure categories but still require caution, especially in February with a UV Index of 10. Visitors and residents should take preventive measures during these high-risk months, such as wearing sunscreen, protective clothing, and sunglasses, to minimize the risk of skin damage from UV radiation.

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	10	12	13	12	13	13	13	12	11	8	7
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