Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Grand Isle, United States, where the sun’s rays can be intense, particularly during the peak summer months. With UV levels peaking at an alarming 11 from noon to early afternoon, awareness of these levels is essential for sunburn prevention and maintaining long-term skin health. Grand Isle’s humid subtropical climate (Cfa) often translates to extended periods of sun exposure, making it vital to monitor UV conditions daily. By being informed and proactive, you can enjoy the beautiful outdoor activities that this coastal paradise offers while protecting your skin from harmful ultraviolet rays.
The UV Index fluctuates throughout the day, beginning with a gentle rise from a modest 1 at 07:00 to a peak of 11 at noon. As the sun reaches its highest point, the intensity of UV radiation escalates, urging caution and protection. The index remains high until 14:00, maintaining a reading of 10, before gradually declining in the afternoon. By 17:00, it drops to 3 and cools off to 1 by evening, highlighting the dramatic shift in UV exposure as daylight fades. For a sun-safe day, plan outdoor activities in the morning or later in the evening!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV levels fluctuate significantly, with high-risk months primarily from February to September. During these months, the UV Index reaches very high to extreme levels, particularly in April, May, June, July, August, and September, where the Index consistently stands at 11 or 12 and the recommended burn time is as low as 10 minutes. February, March, October, and November present a slightly lower risk, but still require caution, especially with UV ratings of 8 to 9. Residents and visitors should prioritize sun safety by seeking shade, wearing protective clothing, and applying sunscreen during peak hours to mitigate the risk of skin damage. Remember, even on cooler days, UV exposure can be significant, so staying vigilant year-round is key.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |
| Grand Isle | 5 | 8 | 9 | 11 | 11 | 11 | 12 | 12 | 11 | 9 | 7 | 5 |