Last updated: June 2, 2025
In Sitka, United States, being aware of the UV Index is essential for maintaining skin health and preventing sunburn, especially given the region's cool, maritime climate. Understanding UV levels helps residents and visitors mitigate the risks associated with sun exposure, as even moderate UV readings—from 3 at 9:00 AM to a peak of 6 around noon—can impact unprotected skin. With UV rays penetrating even through clouds, it’s important for everyone in Sitka to stay informed and take proactive measures to enjoy the outdoors safely while minimizing potential harm.
The UV Index throughout the day presents a clear peak in intensity, rising steadily from a gentle 1 at 07:00 to an assertive maximum of 6 between 12:00 and 14:00. This midday surge emphasizes the importance of sun protection, as the index then gracefully descends back to 1 by 19:00. From 08:00 to 11:00, values increase moderately, showcasing an inviting morning glow, while midday hours certainly warrant caution as the sun reaches its zenith. After 15:00, a gradual decline signals a retreat of UV intensity, allowing a more relaxed late afternoon. Armed with this timely information, outdoor enthusiasts can plan their activities with sun safety in mind!
| 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 | 4 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 5 | moderate | 30 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV Index levels fluctuate significantly, impacting sun exposure safety for both visitors and residents. January to February sees low UV levels (1-2) with a burn time of 45 minutes, making these months safer for outdoor activities. However, as spring approaches, March and April present moderate UV exposure (4-5), decreasing safe sun exposure to 30 minutes. The risk escalates during the summer months of May through August, where high UV indices of 6-7 reduce burn time to just 25 minutes; these months are critical for sun protection. September and October return to moderate levels (5-3) with a burn time of 30 minutes, while November and December drop back to low levels (1), allowing for 45 minutes of safe exposure again. Visitors and residents are advised to take precautionary measures—such as applying sunscreen, wearing protective clothing, and seeking shade during peak hours—especially during the high-risk months of May to August.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sitka | 1 | 2 | 4 | 5 | 6 | 6 | 7 | 7 | 5 | 3 | 1 | 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 |