UV Index in Rio, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Rio, United States, where sun exposure can pose significant risks to skin health. With UV levels peaking at an intense 12 during midday hours, awareness can help you prevent sunburn and long-term skin damage. This Cfa climate zone experiences warm temperatures and abundant sunshine, making it vital to monitor the UV Index daily. By knowing when the sun's rays are strongest, you can take proactive measures to protect yourself, ensuring you enjoy the great outdoors safely while maintaining healthy skin.

Hourly UV Index in Rio

As the sun rises, the UV Index starts off low at a manageable 1 from 07:00 to 08:00. However, things heat up quickly as we move into the late morning; by 10:00, it spikes to 5, reaching 8 at 11:00. The peak intensity occurs at 12:00, with an impressive index of 11, closely followed by 12 at 13:00 and 14:00—the sun is at its strongest! A gradual decrease follows, dropping to 10 by 15:00 and continuing down to 4 at 17:00. As the day winds down, the index relaxes further to 2 at 18:00 and returns to a safe 1 by 19:00. It's clear that today's UV risk peaks around midday, so remember to stay protected during those exposed 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	5	moderate	30 min
11:00	8	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	12	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Rio

Throughout the year, UV exposure significantly fluctuates, with the highest risk months occurring from March through September, where the UV Index consistently reaches extreme levels of 10 to 12. Specifically, April to August presents the greatest danger with an unprecedented UV Index of 12, allowing only a mere 10 minutes before burning may occur. January and November pose moderate to high risks, while December offers the safest conditions with a reduced UV Index of 5. Residents and visitors are strongly advised to take precautionary measures during high-risk months, such as wearing sunscreen, protective clothing, and seeking shade to minimize UV exposure and reduce the risk of sunburn.

Monthly Maximum UV Index for Rio, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Rio. 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 Rio, 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 Rio UV Index with Other United States Cities

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

Rio's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5
Rio	6	9	10	11	11	12	12	12	11	9	7	5