Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Les Houches, France, where the stunning alpine climate can also bring significant sun exposure. With UV levels peaking between 10 AM and 2 PM, reaching as high as 10, being aware of these fluctuations is key to preventing sunburn and safeguarding skin health. The Dfc climate is characterized by mild summers and cold winters, but even in the warmer months, the risk of UV exposure can lead to serious skin damage if not mitigated. Stay informed and protect yourself from harmful rays while enjoying the breathtaking beauty of Les Houches!
As the sun rises, the UV Index begins its steady ascent, starting at a mild 1 at 7:00 AM. By 8:00 AM, it reaches 2, hinting at the day ahead. As we approach mid-morning, the intensity climbs to 3 by 9:00 AM and then dramatically spikes to 5 at 10:00 AM. The real peak occurs between 12:00 PM and 2:00 PM, where the index soars to a whopping 10, indicating strong sun exposure. This midday intensity begins to taper off by 3:00 PM, as it drops to 9, and continues to slide through the late afternoon, ending the day at 1 by 7:00 PM. It's crucial to stay protected during those peak hours to enjoy the sun safely!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 10 | 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 | 1 | low | 45 min |
As the seasons change, so does the UV Index, reflecting varying levels of sun exposure risk. From January to February, the UV Index remains relatively moderate, with a value of 3-4 and a burn time of 30 minutes. However, starting in March, the UV Index rises significantly, reaching high levels of 7 and subsequently peaking at 10 in June and July, marking the months of highest risk. April to August features very high UV Index ratings (8-10), with a critical burn time of only 15 minutes, making it essential for visitors and residents to take precautionary measures by wearing sunscreen, hats, and protective clothing during these months. With a decline in UV exposure in September (7) and further into the fall and winter months, the UV Index drops to moderate (5) in October and then to low (2) by December, allowing for safer outdoor activities. Overall, it is crucial to be vigilant, especially during the high-risk months of March through August, to ensure skin protection against harmful UV radiation.
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 |
| 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 |
| Les Houches | 3 | 4 | 7 | 8 | 9 | 10 | 10 | 9 | 7 | 5 | 3 | 2 |