UV Index in El Letrero, Mexico

Last updated: July 2, 2025

Understanding the UV Index is vital for residents and visitors in El Letrero, Mexico, where the strong sun can pose significant risks to skin health. High UV levels can lead to painful sunburns, accelerated skin aging, and increased risk of skin cancer. With a predominantly tropical climate, El Letrero experiences intense sun exposure, especially during midday hours when the UV Index peaks at a hazardous 14. Being aware of UV levels helps individuals take proactive measures to protect themselves, ensuring enjoyable and safe days under the sun.

Hourly UV Index in El Letrero

The UV Index data paints a vivid picture of the sun’s intensity as the day unfolds. Starting at 07:00, the index is at a safe 0, but by 08:00, it nudges up to 1, indicating a slight increase in UV exposure. As the clock strikes 10:00, things heat up — the index climbs to 4, urging early risers to take precaution. The real peak occurs during the midday hours, where 12:00 sees a blistering 10, escalating to an impressive 13 by 13:00. It reaches its zenith at 14:00 with a staggering 14, representing a critical point for sun safety. The afternoon brings a gradual decline, stretching from 12 at 15:00 down to 3 by 18:00, before settling at 1 as the sun sets at 19:00. This data underscores the importance of sun protection, especially 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	7	high	25 min
12:00	10	very high	15 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 El Letrero

Throughout the year, the UV Index demonstrates significant seasonal fluctuations, with the highest values occurring during the summer and early fall months. Notably, from February to October, the UV index remains in the extreme category, peaking at 14 in April, June, July, and September. This period constitutes the high-risk months, where burn times are alarmingly short, limited to just 10 minutes. Conversely, January, November, and December see lower UV ratings classified as very high, with slightly longer burn times of 15 minutes. To ensure safety, visitors and residents are advised to take precautions during the high-risk months by wearing protective clothing, applying sunscreen, and seeking shade, especially during midday hours.

Monthly Maximum UV Index for El Letrero, Mexico

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

The table above highlights how UV exposure in El Letrero 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.

El Letrero'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
El Letrero	9	11	13	14	13	14	14	13	14	11	9	8
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