UV Index in San Marcos, Mexico

Last updated: July 2, 2025

Understanding the UV Index in San Marcos, Mexico is crucial for staying safe under the sun. The UV Index indicates the strength of ultraviolet radiation and helps you gauge the risk of sunburn and long-term skin damage. In this region's tropical climate, where UV levels can peak at a staggering 13 during the midday hours, being aware of these fluctuations is vital for protecting your skin and maintaining overall health. With this awareness, both locals and visitors can enjoy the sun safely, reducing the risk of sun-related health issues while embracing the beauty of San Marcos.

Hourly UV Index in San Marcos

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 Marcos

Throughout the year, UV exposure varies significantly, with the highest risk months being March through October. During this period, the UV Index peaks at 13, categorized as extreme, particularly from May to July, where the burn time is as short as 10 minutes. The risk remains high in August and September with an index of 12, followed by October at 11. Visitors and residents should prioritize sun safety, especially in these high-risk months, by seeking shade, wearing protective clothing, and applying sunscreen frequently. Conversely, the UV Index drops in the winter months, with December and January showing lower levels, although January and February still have very high ratings. Proper sun precautions are essential year-round to protect against skin damage.

Monthly Maximum UV Index for San Marcos, Mexico

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

The table above highlights how UV exposure in San Marcos 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 Marcos'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 Marcos	8	10	11	12	13	13	13	12	12	11	9	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