Last updated: June 2, 2025
Understanding the UV Index in Alterswil, Switzerland is essential for protecting your skin and maintaining good health. With the potential for significant sunburn and long-term skin damage, being aware of UV levels can help you make informed decisions about sun exposure throughout the day. Alterswil experiences a temperate climate (Cfb), but during sunny months, UV exposure can peak, especially between 11:00 AM and 1:00 PM, where levels can reach as high as 10. Stay vigilant and prioritize your skin’s safety by keeping an eye on the UV Index!
As the sun climbs higher in the sky, the UV Index reaches its peak intensity between 12:00 PM and 1:00 PM, with a striking value of 10—a clear indication that sun protection is essential during this time. The day starts off gently, with a maximum index of 1 at 7:00 AM, gradually rising to a moderate level of 3 by 9:00 AM. By 11:00 AM, we hit 7, and the intensity continues to soar, peaking at 9 around 12:00 PM. However, as the afternoon wanes, the index starts to decline, dropping to 8 at 3:00 PM, and cooling off to 4 by 5:00 PM. As evening approaches, the UV levels return to a milder 1 by 7:00 PM, marking the end of a sun-soaked day. Enjoy the sunshine, but don't forget to stay protected during those peak hours!
| 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 | 9 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal variation, with the highest levels occurring from March to August. During this period, the high-risk months are typically April through August, where the UV Index reaches its peak values of 8 to 10, indicating a very high exposure category and a quick burn time of just 15 minutes. In contrast, the winter months of January and December present lower UV Index values (2), categorized as low exposure, allowing for a longer burn time of up to 45 minutes. It is essential for both visitors and residents to take precautions during high UV Index months, such as wearing sunscreen, protective clothing, and seeking shade, especially between 11 a.m. and 4 p.m. when the sun’s rays are strongest.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basel UVI | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Bern UVI | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 2 |
| Zurich UVI | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 3 | 2 |
| Alterswil | 2 | 3 | 6 | 7 | 8 | 10 | 9 | 8 | 6 | 5 | 3 | 2 |
| Geneve UVI | 2 | 3 | 6 | 7 | 8 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Lausanne UVI | 2 | 4 | 6 | 7 | 8 | 10 | 9 | 9 | 7 | 5 | 3 | 2 |