UV Index in Castro, Brazil

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents and visitors in Castro, Brazil, where the Cfb climate brings both delightful sunshine and potential risks. As UV levels can reach a peak of 8 during the midday hours, awareness of these levels is essential for effective sunburn prevention and overall skin health. With typical exposure risks peaking between 11:00 AM and 1:00 PM, being informed about the day's UV Index can help you take the necessary precautions to enjoy the beautiful outdoors while protecting your skin. Keep an eye on the UV Index—your skin will thank you!

Hourly UV Index in Castro

At sunrise, the UV Index begins at a gentle 1 at 07:00, rising gradually as the sun climbs higher. By 09:00, it reaches 3, indicating a moderate level of UV radiation. The heat of the day peaks at 12:00 with a high of 8, suggesting it’s time to seek shade or apply sunscreen. As the afternoon progresses, the index slightly drops to 7 at 13:00 and continues to decline, settling at 3 by 15:00. As the sun starts to set, the risk diminishing to 1 at 17:00 and finally dropping to 0 by 18:00, signaling a safer time for outdoor activities as the day winds down. Be mindful of the midday sun to protect your skin!

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	5	moderate	30 min
11:00	7	high	25 min
12:00	8	very high	15 min
13:00	7	high	25 min
14:00	6	high	25 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