Last updated: June 2, 2025
In Saint-Justin, France, awareness of the UV Index is crucial for maintaining both skin health and preventing sunburn. With its Cfb climate, this charming town experiences notable UV exposure, especially during peak hours when the index can reach a high of 10. Understanding the UV levels is essential not only for enjoying the suns’ rays safely but also for protecting yourself and your loved ones from the harmful effects of overexposure. As the sun climbs higher each day, monitoring the UV Index becomes your best tool for sun safety and well-being.
The UV Index today shows a striking rise in intensity as the morning unfolds. Starting at 1 at 7:00 AM, it gradually increases to 2 by 9:00 AM. The sunshine peaks dramatically at 10:00 AM, reaching a robust 4, before soaring to its highest point of 10 at 2:00 PM. As the afternoon sun begins its descent, the index slightly dips but remains notable at 9 until 3:00 PM. The day transitions into the evening with values gently falling to 3 by 6:00 PM. With this data, it's clear that protecting your skin during the midday hours—especially between 12:00 PM and 2:00 PM—is essential for safety in the sun.
| 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 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 9 | 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, the UV Index exhibits significant seasonal fluctuations, impacting the risk of UV exposure for visitors and residents. January and December generally feature a low UV Index of 2, allowing for safer outdoor activities, while February and March see a moderate rise to 4 and 5, respectively, with burn times of 30 minutes. Notably, the high-risk months kick off in April with an increased index of 7, reaching a peak during the summer months of May, June, and July, where the UV Index soars to 8-10, indicating very high levels of exposure and shortening burn times to just 15 minutes. This perilous UV exposure slightly recedes in August and September, but still remains significant with indices of 9 and 7. As temperatures cool, October and November return to moderate levels, while January and December revert to low exposure. Visitors and residents are advised to take extra precautions during high-risk months, especially from April to September, by using sunscreen, wearing protective clothing, and seeking shade, particularly during midday hours.
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 |
| 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 |
| Saint-Justin | 2 | 4 | 5 | 7 | 8 | 10 | 10 | 9 | 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 |