UV Index in San Francisco, Argentina

Last updated: July 2, 2025

Understanding the UV Index in San Francisco, Argentina is crucial for promoting skin health and preventing sunburn. With typical UV exposure peaking during the midday hours, it's essential for locals and visitors alike to be aware of daily UV levels to protect their skin from harmful rays. The city's Cfa climate often means clear skies and intense sunlight, leading to increased risks of UV-related skin damage. By keeping an eye on the UV Index, you can enjoy the beautiful San Francisco outdoors while ensuring you and your loved ones stay safe under the sun!

Hourly UV Index in San Francisco

The UV Index throughout the day reveals a dynamic pattern of solar intensity. Starting with a maximum of 0 at 7 AM, it gradually rises to a moderate 5 at 1 PM, where the sun shines its strongest. By 12 PM, the UV Index hits 4, prompting the need for sun protection. The intensity begins to taper off in the afternoon, dropping to 3 by 3 PM, and further decreasing to 1 by 5 PM. As twilight approaches, the UV Index settles back to 0 by 7 PM, signaling the end of the day's sun exposure. Plan accordingly, 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	1	low	45 min
10:00	2	low	45 min
11:00	3	moderate	30 min
12:00	4	moderate	30 min
13:00	5	moderate	30 min
14:00	4	moderate	30 min
15:00	3	moderate	30 min
16:00	2	low	45 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 exhibits significant seasonal fluctuations, with extreme levels in the winter months of January (14), February (13), March (12), and the latter part of the year, including October (11), November (14), and December (14), where the burn time is a mere 10 minutes. High-risk months for UV exposure notably include January, February, March, October, and November, all categorized as extreme risk. As we transition into spring and summer, the UV Index decreases slightly, with April at 8 (very high) and May at 6 (high), while UV levels remain moderate in June and July (4 and 5, respectively). By late summer and early fall, September experiences a spike back to 9 (very high). Visitors and residents should take precautionary measures during high-risk months by wearing protective clothing, applying sunscreen regularly, and limiting sun exposure during peak hours to safeguard against harmful UV radiation.

Monthly Maximum UV Index for San Francisco, Argentina

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 Argentina Cities

The table above highlights how UV exposure in San Francisco compares to other major locations across Argentina. 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 Argentina. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Buenos Aires UVI	14	13	11	7	5	4	4	6	8	10	13	14
Rosario UVI	14	13	11	8	5	4	4	6	8	11	13	14
San Francisco	14	13	12	8	6	4	5	6	9	11	14	14
Mendoza UVI	15	14	12	8	6	4	5	6	9	12	14	15
Cordoba UVI	15	13	12	9	6	4	5	7	9	12	14	15
San Miguel de Tucuman UVI	15	14	13	10	7	5	6	7	10	13	15	15