Last updated: July 2, 2025
In Saint-Jean-de-Daye, France, staying informed about the UV Index is crucial for protecting your skin and overall health. Understanding the daily UV levels helps residents and visitors take proactive measures against sunburn and long-term skin damage, particularly in the region’s temperate Cfb climate, where UV exposure can vary significantly throughout the day. With peak UV Index values reaching 8 during midday hours, awareness is key to enjoying the sun safely while minimizing the risks associated with high UV radiation. Whether you're lounging outdoors or engaging in activities, knowing the UV Index can make all the difference in maintaining healthy skin.
The UV Index rises dramatically as the day unfolds, starting with a mild 1 at 07:00 and escalating to a peak of 8 between 13:00 and 15:00. This midday sun intensity signals a critical time for sun protection, with optimal caution advised given the 7 at 12:00 and the 8 that follows. As the afternoon wanes, the index gradually declines, dropping to 5 by 17:00 and tapering to below 3 by 19:00. It's a day characterized by a significant UV presence, underscoring the importance of vigilance in sun safety during those peak afternoon hours.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 3 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
As the seasons change, so too does the UV Index, which plays a crucial role in understanding sun exposure risks. The highest risk months for UV exposure occur from April to August, particularly peaking in June with a UV Index of 9, categorized as very high, allowing for a burn time of just 15 minutes. Visitors and residents should be especially vigilant during these months, adopting protective measures such as wearing sunscreen, hats, and sunglasses, and seeking shade during peak hours. The UV Index drops significantly in January, November, and December, with low exposure categories, easing sun protection needs during these winter months. However, it’s important to remain aware and prepared for UV fluctuations throughout the year.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Saint-Jean-de-Daye | 2 | 3 | 4 | 6 | 7 | 9 | 8 | 8 | 6 | 4 | 2 | 1 |
| Paris UVI | 2 | 3 | 5 | 6 | 8 | 9 | 8 | 8 | 6 | 4 | 2 | 1 |
| Lyon UVI | 2 | 3 | 5 | 6 | 8 | 10 | 9 | 8 | 6 | 5 | 3 | 2 |
| Nice UVI | 2 | 4 | 6 | 7 | 8 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Marseille UVI | 2 | 4 | 5 | 7 | 9 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Toulouse UVI | 2 | 4 | 6 | 7 | 9 | 10 | 10 | 9 | 7 | 5 | 3 | 2 |