Last updated: August 1, 2025
Awareness of the UV Index is crucial for residents of Redwood, United States, as it plays a vital role in protecting your skin health and preventing painful sunburns. Understanding the varying UV levels throughout the day can empower you to make informed decisions about sun safety, especially during those peak hours between 11 AM and 2 PM, when the index reaches a striking 10. Redwood's Csb climate offers a combination of mild temperatures and increased UV exposure risks, making it essential for locals to stay informed and safeguard their skin while enjoying the outdoors. Whether you're lounging in the sun or engaging in outdoor activities, knowing the UV Index can help ensure a safer and more enjoyable experience.
The UV Index reveals a dynamic ascent and descent throughout the day, peaking with intensity during midday. Starting at a gentle 1 at 7:00 AM, it climbs steadily, reaching 10 by 1:00 PM and maintaining this highest level until 2:00 PM. This critical window indicates significant sun exposure, and it’s essential to take precautions. As the afternoon progresses, the index begins to taper off, dropping to 8 at 3:00 PM, then gradually falling to 1 by 7:00 PM. This data highlights the importance of being sun-smart during the peak hours to minimize UV exposure risks.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | 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 |
The UV Index exhibits significant seasonal variations, with the highest risk occurring during the late spring and summer months. May and June stand out as the months with an extreme UV Index of 11, where the recommended burn time is a mere 10 minutes. April also presents considerable risk with a very high index of 8, reducing burn time to just 15 minutes. As we move into July and August, the UV Index remains elevated at 10, still necessitating caution with a burn time of 15 minutes. September sees a slight drop to 8, but the risk remains substantial. Visitors and residents should take proactive measures during these high-risk months, including seeking shade, wearing protective clothing, and applying sunscreen regularly to prevent skin damage. In contrast, December sees the UV Index drop to 2, indicating a low risk level, where longer exposure is safer.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Redwood | 3 | 4 | 6 | 8 | 11 | 11 | 10 | 10 | 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 |