UV Index in Mariana, Brazil

Last updated: July 2, 2025

Understanding the UV Index in Mariana, Brazil is crucial for safeguarding your skin health and preventing sunburn. With the region's Cwb climate, sun exposure can vary significantly throughout the day, particularly peaking around midday. On sunny days, UV levels can soar to an 8 by noon, indicating a high risk of harm for unprotected skin. By being aware of these fluctuations in UV readings, residents and visitors alike can take proactive measures—such as applying sunscreen and seeking shade—to enjoy the beautiful outdoors while minimizing the risks associated with excessive UV exposure.

Hourly UV Index in Mariana

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 Mariana

Throughout the year, the UV Index reveals significant seasonal variations, with extreme levels prevalent from January to April and again in August through November. The highest values peak during the winter and early spring months, notably reaching a striking 17 in January and 16 in December, indicating extreme risk with a burn time of just 10 minutes. The months of May and July present lower peaks, categorized as very high, with burn times extending slightly to 15 and 25 minutes respectively. Residents and visitors should take extra precautions during the high-risk months of January, February, March, April, August, September, October, and November. Protecting skin with sunscreen, hats, and clothing is crucial, especially during peak hours, to minimize the risk of harmful UV exposure.

Monthly Maximum UV Index for Mariana, Brazil

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

The table above highlights how UV exposure in Mariana 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.

Mariana'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
Belo Horizonte UVI	17	16	14	12	9	7	8	10	12	13	14	16
Mariana	17	15	14	12	9	7	8	11	12	14	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