Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Napavine, United States, where the unique climate of the area can lead to varying levels of sun exposure throughout the day. The UV levels, peaking between 10 AM and 2 PM, can climb to dangerously high numbers, such as 10, making awareness essential for sunburn prevention and maintaining skin health. With the region's cool-summer Mediterranean climate, it's easy to underestimate the risk of UV radiation. By staying informed about the UV Index, you can better protect yourself and your loved ones while enjoying the beautiful outdoors.
As the sun rises, the UV Index gradually climbs, beginning at a mild 1 at 7:00 AM. By 9:00 AM, it reaches 3, prompting early risers to consider sun protection. The intensity peaks at 1:00 PM with a maximum of 10, signaling the most hazardous conditions for unprotected skin. As the afternoon unfolds, the index dips from 9 at 2:00 PM to 6 by 4:00 PM, offering a brief respite. As the day winds down, the UV rays decrease, falling to 2 by 6:00 PM and returning to a safe 1 by 7:00 PM. Stay mindful of these fluctuations to enjoy the sun while safeguarding your skin!
| 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 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences significant seasonal variations, indicating an increase in sun exposure risks during certain months. High-risk months include May, June, July, and August, when the UV Index reaches its peak at 9 to 10 and falls within the very high exposure category. During these months, individuals should limit direct sun exposure, using protective measures such as sunscreen, hats, and UV-blocking clothing, as the burn time can drop to just 15 minutes. Conversely, the low-risk months of January, February, and December, with UV indices of 2 or 3, allow for longer sun exposure safely—up to 45 minutes in winter. As the UV levels fluctuate, it is essential for visitors and residents to stay informed and adapt their sun protection strategies accordingly, particularly during the peak summer months when risks are highest.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Napavine | 2 | 3 | 5 | 6 | 9 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| 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 |