UV Index in Porto, Spain

Last updated: June 2, 2025

Understanding the UV Index in Porto, Spain is crucial for protecting your skin and maintaining overall health. With the potential for high UV exposure, especially during the summer months, being aware of UV levels can help you prevent sunburn and reduce the risk of long-term skin damage. Porto's Csb climate, characterized by mild summers and sunny days, often sees UV Index values peak at an alarming 11 around midday. This makes it essential for locals and visitors alike to stay informed about daily UV levels, ensuring safe outdoor activities while enjoying the beauty of this vibrant coastal city.

Hourly UV Index in Porto

The UV Index throughout the day reveals a dynamic pattern of sun exposure. Starting from a mild 1 at 7:00 AM, the index gradually rises, peaking at an intense 11 between 14:00 and 15:00. This is a critical time for outdoor activities, as exposure to sunlight becomes increasingly intense. Notably, the index jumps from 6 at 11:00 AM to 8 at noon, finally hitting its zenith with a blistering 10 at 1:00 PM. As the sun begins its descent, the UV index graciously falls, settling at 5 by 6:00 PM and tapering off to 3 by 7:00 PM. Be cautious during the peak hours for effective sun safety!

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.
TimeUVICategoryTime to Burn
07:001low45 min
08:001low45 min
09:002low45 min
10:003moderate30 min
11:006high25 min
12:008very high15 min
13:0010very high15 min
14:0011extreme10 min
15:0011extreme10 min
16:009very high15 min
17:007high25 min
18:005moderate30 min
19:003moderate30 min

Monthly UV Index Trends in Porto

The UV Index shows significant seasonal changes, with the highest values occurring during the summer months. From January to February, the UV Index rises modestly from 2 to 4, indicating a shift from low to moderate exposure risks. However, as we move into March and April, the UV Index escalates, peaking in June at 11, categorized as extreme exposure, where the burn time is reduced to just 10 minutes. July and August maintain very high levels, with an index of 10 and 9 respectively, warranting careful sun protection measures. The risk begins to decline in September and October, but remains notable with values of 8 and 6. High-risk months primarily include April through August, where it’s crucial for visitors and residents to limit sun exposure during peak hours, apply sunscreen regularly, and wear protective clothing to reduce the risk of skin damage. As the year closes, the UV Index drops back to lower levels, signaling a return to safer conditions in November and December.

Monthly Maximum UV Index for Porto, Spain

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.
JanFebMarAprMayJunJulAugSepOctNovDec346810111098632
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 Spain Cities

The table above highlights how UV exposure in Porto compares to other major locations across Spain. 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 Spain. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Barcelona UVI34578101097632
Porto24689111098632
Zaragoza UVI34689111198632
Valencia UVI34689111098643
Madrid UVI346810111198643
Sevilla UVI3579101110109743