UV Index in San Fernando de Guaymas, Mexico

Last updated: June 2, 2025

In San Fernando de Guaymas, Mexico, awareness of the UV Index is crucial for protecting your skin from the sun's harmful rays. High UV levels, especially during midday, can lead to severe sunburn and increase the long-term risk of skin health issues. With a BWh climate, the sun shines brightly and directly, particularly from 10 AM to 2 PM, where UV Index values soar to a peak of 12. Understanding these fluctuations is essential for enjoying outdoor activities safely, allowing you to make informed choices about sun protection and ensuring your time in this beautiful coastal city remains both enjoyable and healthy.

Hourly UV Index in San Fernando de Guaymas

As the sun rises, the UV Index begins its ascent, starting at a mild 1 at 07:00. By 08:00, it increases to a moderate 3, but the real surge comes just before noon. The index peaks at an intense 12 during the midday hours, specifically at 12:00, urging sun protection for those outdoors. Following this high, a gradual decrease occurs, with the values declining to 10 by 14:00, then tapering off to 7 at 15:00. As the day wanes, the UV intensity drops significantly, falling to 1 by 19:00, signifying a much safer period for sun exposure. This hourly UVI cycle illustrates a clear pattern: the importance of seeking shade and wearing sunscreen during the peak hours when the sun’s rays are the strongest.

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	3	moderate	30 min
09:00	6	high	25 min
10:00	8	very high	15 min
11:00	11	extreme	10 min
12:00	12	extreme	10 min
13:00	11	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 min
16:00	4	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in San Fernando de Guaymas

The UV Index demonstrates significant seasonal variation, with the highest risks typically occurring from March to September. During this period, the UV Index peaks at 12 in April, May, June, and July, categorized as extreme, where a burn can occur in just 10 minutes. February and October also present high risks with UV Index values at 8 and 9, respectively, requiring 15 minutes for potential burns. Visitors and residents are advised to take precautionary measures during these months, such as wearing sunscreen with high SPF, protective clothing, and seeking shade, especially during peak sun hours. In contrast, January, November, and December feature lower UV indices, categorizing them as moderate or high, allowing for more leisurely outdoor activities with less risk of sunburn.

Monthly Maximum UV Index for San Fernando de Guaymas, Mexico

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

The table above highlights how UV exposure in San Fernando de Guaymas 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 Fernando de Guaymas'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 Fernando de Guaymas	5	8	10	12	12	12	12	11	11	9	7	5
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