Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Sainte-Anne-sur-Vilaine, France, where the climate can have varying effects on UV exposure throughout the year. With UV levels that peak as high as 9 during summer afternoons, awareness is essential for preventing sunburn and promoting long-term skin health. As a Cfb climate zone, this region experiences mild summers but can still pose significant risks during peak sun hours. Staying informed about the UV Index allows everyone to enjoy the outdoors safely while protecting their skin from the harmful effects of ultraviolet rays.
The UV Index for the day reflects a dynamic rise in solar intensity as we move toward midday, peaking at 9 between 1:00 PM and 2:00 PM. Starting off gently, the day begins with a low UV rate of 1 at both 7:00 AM and 8:00 AM, making it safe for early morning activities. As the sun climbs higher, we see a steady increase, hitting 4 by 10:00 AM and reaching 5 at 11:00 AM. By noon, the UV Index escalates to 7, signaling that sun protection is becoming increasingly crucial. Post-peak hours show a gradual decline, with readings at 8 and 7 for 3:00 PM and 4:00 PM, respectively, before tapering off to a more moderate 2 by 7:00 PM. Therefore, it’s essential to stay vigilant during peak hours to safeguard against harmful UV exposure!
| 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 | 4 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 9 | 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 |
Throughout the year, UV exposure fluctuates significantly, with the highest risk months occurring from May to August, when the UV Index reaches levels categorized as very high (UV Index 8-9). During these months, the burn time drastically decreases to just 15 minutes, emphasizing the need for protection. Conversely, the low risk months of January, November, and December offer a safer environment with a UV Index of 2 and a burn time of 45 minutes. As such, visitors and residents should be particularly vigilant during peak summer months by wearing sunscreen, protective clothing, and seeking shade during peak sun hours, while enjoying the milder winter months with less concern for UV exposure.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paris UVI | 2 | 3 | 5 | 6 | 8 | 9 | 8 | 8 | 6 | 4 | 2 | 1 |
| Sainte-Anne-sur-Vilaine | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 2 |
| 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 |