UV Index in Niteroi, Brazil

Last updated: June 2, 2025

Understanding the UV Index in Niteroi, Brazil, is crucial for safeguarding your skin health and preventing sunburn. With its tropical climate, Niteroi experiences varying levels of ultraviolet radiation throughout the day, reaching a maximum index of 6 during peak hours. By being aware of the UV levels, residents and visitors can take necessary precautions, ensuring outdoor activities are both enjoyable and safe. Knowing when to seek shade or apply sunscreen can significantly reduce the risk of harmful skin conditions and ensure a healthy experience under the sun. Stay informed and protect yourself from the hidden dangers of UV rays in this beautiful coastal city!

Hourly UV Index in Niteroi

The UV Index starts low in the early morning, with a maximum of 1 at 07:00 and 08:00, making it a safe time for outdoor activities. As the day progresses, the intensity rises sharply, peaking at 6 between 11:00 and 12:00—the perfect time to take precautions if heading outside. By 13:00, it dips slightly to 5, and a more noticeable decline occurs in the afternoon, falling to 2 by 15:00. As the sun sets, the UV Index drops off sharply, reaching 1 by 16:00, and finally 0 past 18:00. It’s clear that midday sun calls for some sun safety measures, but the later hours provide a much more forgiving environment for enjoying the outdoors!

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	4	moderate	30 min
11:00	6	high	25 min
12:00	6	high	25 min
13:00	5	moderate	30 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 Niteroi

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 Niteroi, Brazil

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

The table above highlights how UV exposure in Niteroi 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.

Niteroi'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
Niteroi	15	14	13	10	7	6	7	9	11	12	13	15
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
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