Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Unalaska, United States, where the unique ET climate can lead to unexpected sun exposure. With UV levels peaking at 8 in the afternoon, awareness of these UV ratings is essential to prevent sunburn and protect skin health. The combination of high UV levels and the often-overcast skies can increase risks without proper precautions. Whether enjoying outdoor activities or simply exploring the breathtaking landscapes, knowing the UV Index can help you stay safe while soaking in the beauty of Unalaska.
As the sun rises, the UV Index starts off gently, peaking at a modest 1 from 07:00 to 09:00. However, things quickly heat up by 10:00, surging to a 2. By 11:00, it climbs to 3, signaling the approach of midday intensity. The real sun power hits its stride between 12:00 and 15:00, reaching a peak of 8 at 15:00—the perfect reminder to seek shade and don those sun hats! As the afternoon wanes, the UV Index begins to dip—falling to 7 at 16:00 and gradually descending back to a more manageable 5 by 18:00. As the day draws to a close, the UV Index settles at 3 by 19:00, marking a gradual retreat of sun exposure. Stay sun-smart and enjoy your day!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 2 | low | 45 min |
| 11:00 | 3 | moderate | 30 min |
| 12:00 | 5 | moderate | 30 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 6 | high | 25 min |
| 18:00 | 5 | moderate | 30 min |
| 19:00 | 3 | moderate | 30 min |
Throughout the year, the UV Index exhibits significant seasonal changes, peaking during the summer months. The high-risk months are July and August, where the UV Index reaches 8 (very high), necessitating a burn time of only 15 minutes. As spring progresses into summer, the UV levels rise from a moderate 3 in March to a dangerous 8 in July, highlighting the need for greater sun protection during late spring and summer. Visitors and residents are advised to take precautions during these months by wearing protective clothing, applying sunscreen, and seeking shade, particularly during peak hours, to minimize the risk of UV-related skin damage. In contrast, the UV Index drops to 1 or 2 in winter (January, February, November, and December), indicating a much lower risk during these cooler months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unalaska | 1 | 2 | 3 | 5 | 6 | 7 | 8 | 8 | 5 | 3 | 2 | 1 |
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |