UV Index in Viseu, Brazil

Last updated: July 2, 2025

Understanding the UV Index is essential for residents and visitors in Viseu, Brazil, as it provides critical information about sun exposure risk throughout the day. With the region's tropical climate, the potential for harmful UV radiation peaks, particularly between 11 AM and 1 PM, where levels can soar to an alarming 11. Being aware of these UV levels is paramount for sunburn prevention and safeguarding skin health, as even moderate exposure can lead to long-term damage. By keeping an eye on the UV Index, you can enjoy the beautiful sunny days in Viseu while effectively protecting yourself from the risks associated with overexposure to the sun.

Hourly UV Index in Viseu

The UV Index today paints a lively picture of solar intensity, starting from a serene 1 at 07:00 and gradually rising to an impressive peak of 11 at noon. As the day progresses, 11:00 and 12:00 reveal the sun at its strongest, urging sunseekers to take precautions against harmful rays. The intensity begins to wane after 14:00, slipping to 8 by mid-afternoon, and tapering off to a gentle 1 by 17:00. Enjoy the warmth but remember to protect your skin, especially when the UV Index hits its zenith!

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	2	low	45 min
09:00	5	moderate	30 min
10:00	8	very high	15 min
11:00	10	very high	15 min
12:00	11	extreme	10 min
13:00	11	extreme	10 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 Viseu

The UV Index demonstrates significant seasonal variations, with the highest values occurring from January to April, peaking at 16, indicating an extreme exposure category and a mere 10-minute burn time for unprotected skin. Throughout the year, the high-risk months remain consistent, with the UV Index consistently at 13 or above from January to May and returning to 13 from August to December, signifying continued high risk even in the latter part of the year. Visitors and residents are advised to exercise extreme caution during all months, especially from January to April, by applying broad-spectrum sunscreen, wearing protective clothing, and seeking shade to minimize harmful exposure to UV radiation.

Monthly Maximum UV Index for Viseu, Brazil

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

The table above highlights how UV exposure in Viseu 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.

Viseu'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
Viseu	14	15	16	16	14	12	11	13	13	13	13	13