UV Index in Port Isabel, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Port Isabel, Texas, where the sun shines brightly in a Cfa climate zone. With UV levels peaking at 12 during midday, awareness of these levels is essential for effective sunburn prevention and maintaining skin health. Port Isabel's warm climate can pose significant UV exposure risks, making it important to protect yourself from harmful rays. By staying informed about the UV Index, you can enjoy the sun while safeguarding your skin from damage.

Hourly UV Index in Port Isabel

As the sun rises, the UV Index starts at a mild 1 at 7:00 AM and remains low until 9:00 AM, where it climbs to 3. By 10:00 AM, the index accelerates to a moderate 5, but it’s at 11:00 AM that the heat intensifies, reaching 8. The peak occurs at 12:00 PM with a staggering value of 10, followed by the highest point of the day at 1:00 PM and 2:00 PM, where it maxes out at 12. After this peak, the index gradually declines: it drops to 10 by 3:00 PM and continues to decrease to 7 at 4:00 PM. By the late afternoon, the intensity wanes, falling to 5 at 5:00 PM and back down to 2 by 6:00 PM, before settling at 1 again as day turns to dusk by 7:00 PM. Remember to shield yourself during the midday hours when the UV radiation is at its most intense!

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
09:003moderate30 min
10:005moderate30 min
11:008very high15 min
12:0010very high15 min
13:0012extreme10 min
14:0012extreme10 min
15:0010very high15 min
16:007high25 min
17:005moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Port Isabel

Throughout the year, UV exposure varies significantly, with the highest levels occurring from March to September. The most critical months are April through August, characterized by an extreme UV Index of 11-12 and a burn time as short as 10 minutes. In contrast, January, November, and December present lower risk with a high UV Index of 6-7 and a longer burn time of 25 minutes. Visitors and residents are strongly advised to take precautions during high-risk months by wearing protective clothing, using broad-spectrum sunscreen, and avoiding direct sun exposure during peak hours. Always stay informed and prioritize skin safety to reduce the risk of UV-related health issues.

Monthly Maximum UV Index for Port Isabel, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Port Isabel. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec69101112121212111076
Data source: Statistical UV Index data for Port Isabel, 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 Port Isabel UV Index with Other United States Cities

The table above highlights how UV exposure in Port Isabel compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Port Isabel's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Los Angeles UVI46891011111010754
Houston UVI589111112121110975
Port Isabel69101112121212111076