UV Index in Castelo do Piaui, Brazil

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors of Castelo do Piauí, Brazil, where the tropical climate makes sun exposure a daily reality. As the sun reaches its highest intensity, particularly between 10:00 AM and 2:00 PM, the UV Index can skyrocket to levels as high as 11, posing significant risks for sunburn and long-term skin damage. Awareness of these UV levels is essential not only for preventing immediate discomfort but also for maintaining overall skin health. With the region's typical exposure risks, staying informed about the UV Index can help you enjoy the sun safely and protect your skin in this vibrant, sun-drenched locale.

Hourly UV Index in Castelo do Piaui

The UV Index shows a dramatic rise in intensity as the day unfolds, starting from a gentle 1 at 07:00. By 09:00, it escalates to 5, indicating a moderate level of UV radiation. The peak occurs between 11:00 and 12:00, where the index reaches a blazing 11, signaling a very high risk of harm from unprotected sun exposure. As the afternoon progresses to 13:00, it slightly dips to 10 before steadily declining through 14:00 with a value of 7, to a much safer 2 by 16:00. The evening brings relief as the UV Index wanes to 1 by 17:00, effectively diminishing to 0 after 18:00. Remain cautious during the intense hours, particularly around midday, to protect your skin from UV damage!

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	3	moderate	30 min
09:00	5	moderate	30 min
10:00	9	very high	15 min
11:00	11	extreme	10 min
12:00	11	extreme	10 min
13:00	10	very high	15 min
14:00	7	high	25 min
15:00	4	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 Castelo do Piaui

The UV Index remains consistently high throughout the year, with values ranging from 11 to 15 in the extreme exposure category, indicating that the risk of harm from unprotected sun exposure is significant. High-risk months include March and April with an index peaking at 15, closely followed by January and February, both at 14. During these months, the burn time is as short as 10 minutes, emphasizing the need for caution. Visitors and residents are strongly advised to take protective measures, such as wearing sunscreen, protective clothing, and seeking shade during peak sun hours, especially from March to April when UV levels are at their highest. Stay safe and be sun-smart all year round!

Monthly Maximum UV Index for Castelo do Piaui, Brazil

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

The table above highlights how UV exposure in Castelo do Piaui 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.

Castelo do Piaui'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
Castelo do Piaui	14	14	15	15	13	11	11	13	13	13	14	14