UV Index in Porto, Brazil

Last updated: May 3, 2025

In Porto, Brazil, being aware of the UV Index is crucial for maintaining skin health and preventing sunburn. Understanding UV levels is essential, especially in regions where the sun can be intense, helping you take proactive measures to safeguard your skin under the Brazilian sun. With a tropical climate, Porto experiences significant UV exposure, particularly during midday hours when the index peaks at a staggering 13 between 12:00 PM and 1:00 PM. This highlights the importance of staying informed about UV risks, so you can enjoy the beautiful outdoors while protecting your skin effectively.

Hourly UV Index in Porto

The UV Index data reveals a dramatic transformation throughout the day. Early in the morning, at 07:00, the UV Index starts at a minimal 1, but by 09:00, it skyrockets to 7, indicating a rise in sun intensity. The peak occurs between 11:00 and 12:00, where it reaches its zenith at an impressive 13, showcasing the potential for skin damage without protection. As the afternoon progresses, the index gradually declines, with values dropping to 4 by 15:00 and further dwindling to a 0 by 19:00. This pattern highlights the importance of sun safety during the midday hours when UV radiation is most potent, urging us to embrace the shade and apply sunscreen accordingly.

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	7	high	25 min
10:00	10	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	11	extreme	10 min
14:00	8	very high	15 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 Porto

The UV Index shows an extreme risk of harm from unprotected sun exposure throughout the year, with very high levels observed from January to March, peaking at 16 in March. This indicates that the sun’s rays can cause skin burn in as little as 10 minutes. April maintains a high UV Index of 15, and while there is a slight decrease in June and July (both at 11), the exposure risk remains severe. August and September return to a UV Index of 13, continuing the call for diligent sun protection. As October progresses to 12 and into the late autumn months, visitors and residents should still remain vigilant, especially since November and December retain a UV Index of 13. To minimize risk, it is essential for everyone to apply sunscreen, wear protective clothing, and seek shade during peak sun hours throughout all seasons.

Monthly Maximum UV Index for Porto, Brazil

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

The table above highlights how UV exposure in Porto 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.

Porto'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
Porto	14	14	16	15	13	11	11	13	13	12	13	13