UV Index in Rialma, Brazil

Last updated: July 2, 2025

Understanding the UV Index in Rialma, Brazil is crucial for safeguarding your skin and overall health. With UV levels climbing as high as 10 around midday, awareness of these fluctuations helps prevent sunburn and long-term skin damage. Rialma's tropical climate, characterized by high temperatures and strong sunlight, poses notable UV exposure risks, particularly during peak hours between 10 AM and 2 PM. By staying informed about local UV levels, residents and visitors can make informed decisions about sun protection, ensuring enjoyable and safe outdoor activities.

Hourly UV Index in Rialma

The UV Index reveals a dynamic day of sun exposure, starting off gently with a low of 1 at 7:00 AM and 8:00 AM. As the sun climbs higher, the index begins to rise sharply, peaking at 10 by noon, signaling ideal conditions for outdoor activities—though caution is advised. The intensity remains high as it slightly dips to 9 at 1:00 PM and 7 at 2:00 PM, before tapering off in the afternoon. By 4:00 PM, the index drops to 2, and the sun’s intensity continues to fade, reaching 0 by 6:00 PM. This hourly trend underscores the importance of sun safety during peak hours, particularly from 10:00 AM to 2:00 PM, when protection is most crucial.

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	6	high	25 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	9	very high	15 min
14:00	7	high	25 min
15:00	5	moderate	30 min
16:00	2	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 Rialma

The UV Index data indicates that extreme UV levels are prevalent from January to May and again in August to November, with the highest values of 16 occurring in January, February, November, and December. Visitors and residents should remain vigilant during these months, with a burn time of just 10 minutes under direct sunlight. March through April sees slightly lower levels, yet still labeled as extreme. From June to July, the UV Index dips to 9 and 10, categorized as very high, allowing for a slightly longer burn time of 15 minutes. As the summer transitions into fall, the UV Index peaks again in August at 12. It’s crucial for everyone to protect themselves by seeking shade, wearing UV-protective clothing, and applying sunscreen, especially during these high-risk months.

Monthly Maximum UV Index for Rialma, Brazil

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

The table above highlights how UV exposure in Rialma 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.

Rialma'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
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
Rialma	16	16	14	13	11	9	10	12	13	15	15	16