UV Index in San Francisco (El Calvito), Mexico

Last updated: July 2, 2025

Understanding the UV Index is essential for residents and visitors of San Francisco (El Calvito), Mexico, where the risk of harmful UV radiation can be surprisingly high. With daily fluctuations in UV levels, being aware of these indices is crucial for preventing sunburn and promoting long-term skin health. San Francisco experiences a unique Aw climate, characterized by sunny days that can lead to elevated UV exposure, especially during peak hours when the index reaches as high as 15. By keeping an eye on the UV Index, you can enjoy the beautiful sunny days while protecting yourself from the potentially damaging effects of the sun.

Hourly UV Index in San Francisco (El Calvito)

At 07:00, the UV Index begins its day at a low 1, making it a safe time for early risers. As the sun climbs higher, it rises steadily, hitting 3 by 09:00. The real intensity bursts forth around 10:00 with a sharp leap to 7, and by 11:00, we reach a striking 11, signaling it's time to seek shade. The peak intensity occurs at 12:00, with the UV Index soaring to an impressive 14, followed closely by a slight dip to 15 at 13:00. The afternoon maintains this high level, remaining at 14 until 14:00 before gradually decreasing. By 15:00, the UV Index drops to 11, followed by a gentle decline to 4 by 17:00. As the sun sets, the index falls to 2 at 18:00 and returns to a safe 1 by 19:00, marking the end of a day with potent solar energy that calls for caution during its 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	1	low	45 min
08:00	1	low	45 min
09:00	3	moderate	30 min
10:00	7	high	25 min
11:00	11	extreme	10 min
12:00	14	extreme	10 min
13:00	15	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 San Francisco (El Calvito)

Throughout the year, UV exposure levels vary significantly, with the highest risks occurring from February to October. During these months, the UV Index frequently reaches extreme levels, peaking at 15 in April through July, meaning that a burn can occur in just 10 minutes. It is crucial for visitors and residents to take precautions during these high-risk months, such as seeking shade, wearing protective clothing, and applying sunscreen liberally. Notably, January and November see a slightly lower UV Index of 10, categorized as very high, resulting in a burn time of 15 minutes. The least intense UV levels occur in December with an index of 9, but vigilance is still advised. Overall, awareness and proactive sun protection are essential to prevent harmful effects from UV radiation throughout the year.

Monthly Maximum UV Index for San Francisco (El Calvito), Mexico

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

The table above highlights how UV exposure in San Francisco (El Calvito) 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 Francisco (El Calvito)'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
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
San Francisco (El Calvito)	10	13	14	15	15	15	15	14	14	13	10	9