UV Index in Tres Rios, Brazil

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents and visitors in Tres Rios, Brazil, where the subtropical Cfa climate can lead to varying levels of sun exposure throughout the day. Being aware of UV levels is essential for preventing sunburn and maintaining long-term skin health, especially when the UV Index peaks as high as 8 around midday. With the risk of harmful UV rays increasing during sunny hours, it's vital to take precautions, ensuring safe enjoyment of the region's warm climate while protecting your skin from potential damage. Stay informed and stay safe under the Brazilian sun!

Hourly UV Index in Tres Rios

As the sun rises, the UV Index begins its ascent, starting at a gentle 1 by 7:00 AM. By 8:00 AM, it nudges up to 2, signaling a mild increase in UV exposure. The intensity heats up quickly, reaching a moderate 4 by 9:00 AM, before hitting its peak of 8 from 11:00 AM to 12:00 PM. This is the prime time for sun safety awareness! After noon, the UV Index gradually declines; by 3:00 PM, it recedes to 3, and as the day wanes, it drops significantly to 1 by 4:00 PM. By evening, UV levels have diminished, reaching 0 by 6:00 PM, offering a reprieve from the sun’s rays.

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	8	very high	15 min
13:00	7	high	25 min
14:00	5	moderate	30 min
15:00	3	moderate	30 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 Tres Rios

The UV Index experiences significant seasonal changes, with the highest levels occurring during the first half of the year. The high-risk months are from January to April and September to November, where the UV Index consistently falls within the extreme category, peaking at 16 in January and steadily remaining high through October with levels around 13-15. During these months, burn time is as short as 10 minutes, emphasizing the need for heightened sun protection measures. Conversely, the UV Index drops slightly in June and July, reaching a very high level of 6-8, with a more manageable burn time of 15-25 minutes. Visitors and residents are advised to remain vigilant year-round, particularly during high-risk periods, by using sunscreen, wearing protective clothing, and seeking shade whenever possible to minimize sun damage.

Monthly Maximum UV Index for Tres Rios, Brazil

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

The table above highlights how UV exposure in Tres Rios 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.

Tres Rios'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 UVI	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
Tres Rios	16	15	13	11	8	6	8	10	12	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