UV Index in Pirai, Brazil

Last updated: July 2, 2025

In Piraí, Brazil, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. Understanding UV levels can empower you to take necessary precautions during peak hours, particularly when the index reaches 6 or 7 between 11 AM and 1 PM. With Piraí’s tropical climate, residents and visitors face increased UV exposure risks throughout the day, especially during the summer months. Being informed about UV changes and taking protective measures can significantly reduce the chances of skin damage and enhance your overall well-being. Stay safe under the sun by keeping an eye on the UV Index!

Hourly UV Index in Pirai

The UV Index reveals a dynamic day of sun exposure. Beginning at a gentle 1 at 7:00 AM and 8:00 AM, the index gradually rises, hitting 3 by 9:00 AM. A significant surge occurs at 10:00 AM, with the UV Index climbing to 5, peaking at an intense 7 at 12:00 PM. The intensity then begins to decline, with values of 6 at 1:00 PM, dropping to 4 by 2:00 PM, and further decreasing to 3 at 3:00 PM. As the afternoon wanes, the index returns to 1 by 4:00 PM and finally falls to 0 after 6:00 PM, marking a gentler evening. It's a reminder to stay sun-smart during those midday hours when UV exposure is at its highest!

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	6	high	25 min
12:00	7	high	25 min
13:00	6	high	25 min
14:00	4	moderate	30 min
15:00	3	moderate	30 min
16:00	1	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 Pirai

Throughout the year, the UV Index exhibits significant seasonal changes, with particularly high levels between January and April where the index reaches 15-12 and the exposure category is classified as extreme. The months of September to November also present high-risk conditions, with indices of 11-13 and extreme burn times of only 10 minutes. In the summer months of May to August, the UV index falls slightly but remains in the very high to high categories, increasing burn times to 15-25 minutes. Visitors and residents should exercise caution, particularly during these high-risk months, by seeking shade, applying broad-spectrum sunscreen, and wearing protective clothing to mitigate the effects of UV radiation.

Monthly Maximum UV Index for Pirai, Brazil

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

The table above highlights how UV exposure in Pirai 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.

Pirai'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
Pirai	15	15	12	11	8	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