UV Index in Cal y Mayor, Mexico

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Cal y Mayor, Mexico, where the sun's rays can pose serious health risks. With peak UV levels reaching a staggering 14, awareness of these figures plays a vital role in preventing sunburn and promoting long-term skin health. Given Cal y Mayor's warm climate, where sunny days abound, it's imperative to stay informed about daily UV exposure risks to enjoy the outdoors safely. By keeping an eye on the UV Index, you can make smarter choices about sun protection, ensuring you and your loved ones can bask in the sun without worry.

Hourly UV Index in Cal y Mayor

As the sun rises, the UV Index starts off low at 1 from 7:00 AM to 8:00 AM, making it safe for morning activities. However, by 9:00 AM, the intensity rises to 3, signaling the need for some sun protection. The real peak occurs between 11:00 AM and 2:00 PM, where the UV Index reaches a striking 14 at 1:00 PM—this is when the sun is at its strongest, and precautions are essential. As the afternoon transitions into evening, the Index begins to decline, dropping to 11 at 3:00 PM, and then gently tapering off to 1 by 7:00 PM. Be mindful of the sun's rays and plan your outdoor activities accordingly!

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	3	moderate	30 min
10:00	6	high	25 min
11:00	9	very high	15 min
12:00	13	extreme	10 min
13:00	14	extreme	10 min
14:00	14	extreme	10 min
15:00	11	extreme	10 min
16:00	8	very high	15 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Cal y Mayor

Throughout the year, UV index levels fluctuate significantly, peaking during the late spring and summer months. From February to October, the UV index consistently remains in the extreme category, with the highest readings in April, May, June, and July, all reaching a UV index of 14 and a burn time of just 10 minutes. As such, March through October is deemed the high-risk period for skin damage and sunburn. Visitors and residents are strongly advised to take precautions, including wearing protective clothing, applying broad-spectrum sunscreen frequently, and seeking shade—especially during midday hours—to reduce the risk of harmful UV exposure. In contrast, November and December see a decrease in UV levels, transitioning to a very high category, but it’s still important to stay vigilant as burn times extend to 15 minutes.

Monthly Maximum UV Index for Cal y Mayor, Mexico

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

The table above highlights how UV exposure in Cal y Mayor 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.

Cal y Mayor'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
Cal y Mayor	9	12	13	14	14	14	14	13	13	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