UV Index in Rio, United States

Last updated: June 2, 2025

Understanding the UV Index in Rio, United States is crucial for protecting your skin and overall health. With UV levels peaking at 10 during the midday hours, awareness is key to preventing sunburn and long-term skin damage. The climate in Rio, characterized by cool summers and cold winters, can still expose residents to risky UV levels, especially from late spring to early fall. By staying informed about the UV Index, you can enjoy outdoor activities safely while ensuring your skin remains healthy and protected from harmful rays.

Hourly UV Index in Rio

The UV Index throughout the day showcases a dynamic pattern of sun exposure, peaking during the afternoon. At 07:00, the index starts low at 1, gradually increasing as the sun rises. By 10:00, it reaches 6, signaling a rise in sun intensity, culminating in a striking 10 from 12:00 to 13:00, indicating a high risk of harm from unprotected sun exposure. As the day progresses, the UV Index declines, dropping to 3 by 17:00, and steadily returning to 1 by 19:00. This data highlights the importance of sun protection, especially during midday when the UV Index is at its highest.

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	2	low	45 min
09:00	4	moderate	30 min
10:00	6	high	25 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	10	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 min
16:00	5	moderate	30 min
17:00	3	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 levels fluctuate significantly, with high-risk months generally spanning from April to August. During this period, particularly in May and June, the UV Index peaks at 10, indicating a very high risk of harm from unprotected sun exposure, with a rapid burn time of just 15 minutes. Comparatively, the UV Index is moderate in the winter months of January to March, and again in October and November, where the burn time extends to 30 minutes. As the year progresses into December, the UV risk decreases further, classified as low, allowing for a safer 45-minute exposure before burning. Visitors and residents are advised to be vigilant in the spring and summer months, taking necessary precautions such as applying sunscreen, wearing protective clothing, and seeking shade during the peak sun hours to minimize the risks of skin damage.

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
Rio	3	4	5	8	9	10	10	9	7	5	3	2
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