Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Saint-Louis, Réunion, where the tropical climate can pose significant risks due to intense sun exposure. The UV Index provides essential information about the strength of ultraviolet radiation, helping you to prevent sunburn and protect your long-term skin health. With typical UV levels peaking around noon, reaching a maximum of 8 during the summer months, awareness of these fluctuations can empower you to enjoy the outdoors safely. Stay informed about the UV Index to make smart choices about sun protection and enjoy the beautiful sunshine that Saint-Louis has to offer!
As the day breaks, the UV Index gradually rises, peaking at a robust 8 at 12:00 PM, signaling the sun's intensity is at its highest. Starting from a mild 1 at 07:00 AM and 08:00 AM, the UV levels steadily climb, hitting 5 by 10:00 AM. By 11:00 AM, a brisk 7 indicates that sun safety measures are essential. The intensity slightly declines after noon, tapering off to 6 at 2:00 PM, and then gradually decreases to a 4 by 3:00 PM. By evening, the UV Index drops back to a mere 1 at 5:00 PM and ultimately falls to 0 after 6:00 PM, signaling a safe return home as the sun sets. Keep this UV pattern in mind for outdoor activities to protect your skin and enjoy the day!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 6 | high | 25 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 |
The UV Index experiences significant seasonal variations, peaking in the early months of the year. From January to April, the UV Index remains at an extreme level, ranging from 16 to 12, with a minimal burn time of just 10 minutes. As we transition into late spring and summer, the UV Index slightly decreases, reaching a very high level of 9 in May and fluctuating between 7 to 10 in June to August, resulting in burn times of 15 to 25 minutes. However, the risk remains elevated, with September to December witnessing a return to extreme levels once again, particularly in November at 14. Visitors and residents should be particularly cautious during the high-risk months of January to April and September to November, ensuring they take appropriate sun safety measures, such as wearing protective clothing, applying sunscreen, and limiting direct sun exposure during peak hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Saint-Paul UVI | 16 | 16 | 14 | 12 | 8 | 7 | 8 | 10 | 11 | 12 | 14 | 15 |
| Saint-Andre UVI | 16 | 16 | 14 | 12 | 9 | 7 | 8 | 10 | 11 | 13 | 14 | 15 |
| Saint-Denis UVI | 16 | 16 | 14 | 12 | 9 | 7 | 8 | 10 | 11 | 13 | 14 | 15 |
| Saint-Louis | 16 | 17 | 14 | 12 | 9 | 7 | 8 | 10 | 11 | 13 | 14 | 15 |
| Le Tampon UVI | 16 | 17 | 14 | 12 | 9 | 7 | 8 | 10 | 11 | 13 | 14 | 15 |
| Saint-Pierre UVI | 16 | 17 | 14 | 12 | 9 | 7 | 8 | 10 | 11 | 13 | 14 | 15 |