UV Index in Castilho, Brazil

Last updated: August 1, 2025

Understanding the UV Index is crucial for residents of Castilho, Brazil, where the tropical climate can bring varying levels of ultraviolet radiation throughout the day. Awareness of UV levels plays a vital role in preventing sunburn and maintaining overall skin health, particularly during peak hours when the index climbs to a high of 8 between noon and 1 PM. With predominant sunlight in the region, it's essential for everyone to recognize the potential risks associated with UV exposure, ensuring they take appropriate protective measures to enjoy the beautiful Brazilian sun safely.

Hourly UV Index in Castilho

As the sun rises, the UV Index begins its ascent, starting at a gentle 1 by 7:00 AM and remaining low at 8:00 AM. By 9:00 AM, it edges up to 2, but the real intensity kicks in at 10:00 AM with a surge to 4. The peak occurs around 12:00 PM and 1:00 PM, where it reaches a scorching 8, representing a significant rise in UV exposure. As the afternoon unfolds, the index begins its descent, dropping to 6 by 2:00 PM and easing to 4 by 3:00 PM. Before the sun sets, the UV levels taper off quickly, with readings of 2 at 4:00 PM and declining to 0 by 6:00 PM. This hourly data serves as a reminder to stay protected during peak UV hours, particularly between 11:00 AM and 1:00 PM.

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	9	very high	15 min
12:00	10	very high	15 min
13:00	10	very high	15 min
14:00	8	very high	15 min
15:00	5	moderate	30 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Castilho

The seasonal UV changes indicate that exposure levels are consistently high, particularly from January to April, where the UV Index remains in the extreme category, peaking at 16 in February and December. High-risk months include January, February, March, April, September, October, and November, as they all feature an extreme UV Index that can lead to sunburn in as little as 10 minutes. Conversely, the summer months of May, June, July, and August experience a drop to very high and high categories, with slightly longer burn times of 15 to 25 minutes. Visitors and residents should take precautions during all months, especially in extreme UV conditions, by seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen to minimize the risk of skin damage.

Monthly Maximum UV Index for Castilho, Brazil

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

The table above highlights how UV exposure in Castilho 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.

Castilho'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
Castilho	15	16	13	11	8	7	8	10	12	14	14	16
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