Last updated: July 2, 2025
In Puerto Williams, Chile, being aware of the UV Index is crucial for maintaining skin health and preventing sunburn. Understanding UV levels helps you make informed decisions about sun exposure, especially in this subpolar oceanic climate where the sun can be deceptively strong despite the cooler temperatures. With UV Index readings typically peaking at 1 during midday hours, it’s essential to take precautionary measures to protect your skin from long-term damage, even in this remote region. Whether you’re exploring the stunning landscapes or enjoying outdoor activities, staying informed about UV risks will help you enjoy the beauty of Puerto Williams safely.
Throughout the day, the UV Index showed a gradual rise, peaking during the midday hours. From 07:00 to 09:00, the index remained at a safe 0, providing a perfect time for morning activities without the worry of UV exposure. As the sun climbed higher, the index increased to 1 from 10:00 through 17:00, indicating a low level of UV radiation, suitable for outdoor enjoyment with minimal protection. However, as the day drew to a close, the UV Index dipped back to 0 by 18:00, signaling a retreat of sunlight and a decrease in UV intensity. Overall, it was a day where individuals could bask in the sun's warmth without significant risk, especially during the midday stretch.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 0 | low | 45 min |
| 09:00 | 0 | low | 45 min |
| 10:00 | 1 | low | 45 min |
| 11:00 | 1 | low | 45 min |
| 12:00 | 1 | low | 45 min |
| 13:00 | 1 | low | 45 min |
| 14:00 | 1 | low | 45 min |
| 15:00 | 1 | low | 45 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV exposure varies significantly, with January and February marking the peaks of very high UV Index levels at 9 and 8, respectively, which means a burn time of just 15 minutes. The high-risk months also include March with a UV Index of 6 (burn time: 25 minutes) and the extreme levels in November and December with indices of 12 and 11, respectively, where the burn time decreases to 10 minutes. Between late spring and mid-summer, the UV levels drop to low, particularly in May, June, and July, making sun exposure less hazardous. However, as we transition back into late fall, UV levels rise again. Visitors and residents should take precautions during high-risk months by seeking shade, wearing protective clothing, and applying sunscreen to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Puerto Williams | 9 | 8 | 6 | 3 | 2 | 1 | 1 | 3 | 5 | 9 | 12 | 11 |
| Santiago UVI | 14 | 12 | 11 | 7 | 5 | 3 | 4 | 6 | 8 | 11 | 12 | 14 |
| Valparaiso UVI | 14 | 12 | 11 | 8 | 5 | 4 | 4 | 6 | 8 | 11 | 12 | 14 |
| Vina del Mar UVI | 14 | 12 | 11 | 8 | 5 | 4 | 4 | 6 | 8 | 11 | 12 | 14 |
| Puente Alto UVI | 15 | 14 | 12 | 8 | 6 | 4 | 6 | 8 | 11 | 12 | 14 | 15 |
| Antofagasta UVI | 15 | 15 | 13 | 10 | 8 | 6 | 7 | 9 | 11 | 14 | 15 | 15 |