UV Index in Castro, Brazil

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors of Castro, Brazil, where the Cfb climate can present unique sun exposure challenges. With UV levels reaching as high as 7 during midday, awareness of these readings is essential for preventing sunburn and protecting overall skin health. As you enjoy thebeautiful surroundings of Castro, knowing when to seek shade or apply sunscreen can make all the difference in safeguarding your skin against harmful radiation. Stay informed about daily UV levels to ensure your outdoor activities are not only enjoyable but safe!

Hourly UV Index in Castro

The UV Index data reveals a significant fluctuation in solar intensity throughout the day. Starting at 07:00, the index registers a low 1, indicating minimal risk. As the sun climbs higher, it peaks dramatically at 12:00 with a 7, categorizing it as high. This midday zenith is crucial for outdoor activities; however, caution is advised. The afternoon sees a slight decline, dropping to 3 by 15:00, and eventually receding to 0 after 18:00. Thus, while the early hours offer safe sun exposure, midday warrants protective measures to shield against harmful UV 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	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	6	high	25 min
12:00	7	high	25 min
13:00	6	high	25 min
14:00	5	moderate	30 min
15:00	3	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 Castro

Throughout the year, UV exposure varies significantly, with the highest levels occurring from January to April and returning again in September to November. During these months, the UV Index peaks at 16, indicating an extreme risk of harm from unprotected sun exposure, with a burn time of just 10 minutes. May and August experience a slight reduction in risk, categorized as very high with an index of 8 and 9, respectively, thus extending the burn time to 15 minutes. The summer months of June and July show a decreased index of 6 and 7 with high exposure categories, allowing for longer exposure times of 25 minutes. Visitors and residents should exercise heightened caution during the high-risk months, ensuring adequate sun protection, such as sunscreen, clothing, and hats, especially during peak UV hours.

Monthly Maximum UV Index for Castro, Brazil

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

The table above highlights how UV exposure in Castro 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.

Castro'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
Castro	16	16	13	11	8	6	7	9	11	14	15	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