UV Index in San Francisco, El Salvador

Last updated: June 2, 2025

In the heart of San Francisco, El Salvador, understanding the UV Index is crucial for maintaining skin health and preventing sunburn. The UV Index serves as a vital indicator of the sun's strength, helping residents and visitors alike make informed decisions about sun exposure. With the region's tropical climate, outdoor activities are tempting, especially during peak hours when UV levels can soar to a staggering 14 around noon. By staying aware of daily UV fluctuations, you can protect your skin and enjoy the beautiful sun-drenched days of San Francisco while minimizing the risks of overexposure.

Hourly UV Index in San Francisco

The UV Index today paints a vivid picture of sun intensity throughout the day. Early risers will experience a gentle start at 07:00 with a low of 2, slowly escalating to a more noticeable 4 by 08:00. As the sun climbs higher, the UV Index reaches a peak of 14 at 12:00—the critical midday moment when sun protection is essential. From there, it begins to taper off, dropping to 12 at 13:00 before plunging down to 1 by 17:00. As evening approaches, UV exposure decreases, ultimately settling at 0 by 19:00. Remember to stay sun-safe 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	2	low	45 min
08:00	4	moderate	30 min
09:00	7	high	25 min
10:00	11	extreme	10 min
11:00	13	extreme	10 min
12:00	14	extreme	10 min
13:00	12	extreme	10 min
14:00	9	very high	15 min
15:00	6	high	25 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in San Francisco

The UV Index clearly demonstrates a pattern of extreme sun exposure from January through July. The highest values peak in March to June, with an index of 14, indicating the most critical months for UV risk. As summer transitions into fall, the index gradually decreases but remains at a high level through August and September. Notably, November and December present a slight reduction to very high levels, with a burn time of 15 minutes. Residents and visitors should take precautionary measures during these high-risk months, such as wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade to minimize UV exposure and prevent sunburn.

Monthly Maximum UV Index for San Francisco, El Salvador

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

The table above highlights how UV exposure in San Francisco compares to other major locations across El Salvador. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

San Francisco's solar exposure compared to other cities in El Salvador. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
San Francisco	11	12	14	14	14	14	13	13	13	13	10	9
Mejicanos UVI	11	12	14	14	14	14	13	13	13	13	10	9
Soyapango UVI	11	12	14	14	14	14	13	13	13	13	10	9
San Salvador UVI	11	12	14	14	14	14	13	13	13	13	10	9
San Miguel UVI	11	12	14	14	14	14	13	13	13	13	10	9
Santa Ana UVI	11	13	14	14	14	14	14	13	13	13	10	9