UV Index in Rio de Janeiro, Brazil

Last updated: May 3, 2025

In the vibrant city of Rio de Janeiro, Brazil, being aware of the UV Index is crucial for maintaining skin health and preventing sunburn. With its tropical climate and abundant sunshine, Rio faces significant UV exposure risks, especially during peak hours. Understanding UV levels can help residents and visitors alike protect themselves from harmful rays, ensuring that fun in the sun doesn’t lead to unwanted skin damage. Notably, UV levels can surge to 7 between 11 AM and 1 PM, indicating a high risk for harm — so staying informed is essential for enjoying Rio’s beautiful beaches and outdoor attractions safely.

Hourly UV Index in Rio de Janeiro

As the day unfolds, the UV Index reaches its peak during the late morning and early afternoon hours. Starting at a mild 1 at 7 AM, the index gradually climbs to a more noticeable 7 by 11 AM, signaling a time when sun protection becomes essential. It holds steady at 7 until noon, then begins to decline, dipping to 4 by 2 PM, and further falling to 1 by 4 PM. By evening, the UV Index drops to 0, indicating a safe time to enjoy the outdoors without the worry of harmful UV exposure. Remember, during the peak hours from 10 AM to 2 PM, it's crucial to wear sunscreen and protective clothing to safeguard your skin!

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	7	high	25 min
12:00	7	high	25 min
13:00	6	high	25 min
14:00	4	moderate	30 min
15:00	2	low	45 min
16:00	1	low	45 min
17:00	1	low	45 min
18:00	0	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Rio de Janeiro

Throughout the year, UV Index values experience significant fluctuations, with January, February, March, September, October, November, and December categorized as high-risk months due to their extreme exposure levels (UV Index 13-15) and a rapid burn time of 10 minutes. In contrast, April and August will see very high readings (UV Index 10 and 9, respectively) with a burn time of 15 minutes, while May, June, and July present a high exposure risk (UV Index 6-7) but with extended burn times of 25 minutes. To protect themselves, visitors and residents should strictly limit sun exposure during these high-risk months, seek shade whenever possible, and apply broad-spectrum sunscreen regularly, especially during peak sun hours.

Monthly Maximum UV Index for Rio de Janeiro, Brazil

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

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

Rio de Janeiro's solar exposure compared to other cities in Brazil. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Rio de Janeiro	15	14	13	10	7	6	7	9	11	12	13	15
Sao Paulo UVI	16	15	12	11	8	6	7	9	11	13	14	15
Belo Horizonte UVI	17	16	14	12	9	7	8	10	12	13	14	16
Salvador UVI	14	14	14	13	10	9	9	12	12	15	15	14
Fortaleza UVI	14	14	15	15	13	11	11	12	13	13	13	13