Last updated: July 2, 2025
In Redwood, United States, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. As the sun's rays can reach their peak intensity during midday, understanding UV levels can empower residents and visitors to take proactive measures to protect themselves. In this Cfa climate zone, where warm summers make outdoor activities tempting, the UV Index frequently rises throughout the day, peaking at a significant level of 12 around 1 PM. Being informed about UV exposure risks helps ensure a safe and enjoyable experience in the sun, allowing you to bask in the beauty of Redwood while safeguarding your skin.
The UV Index throughout the day paints a vivid picture of the sun's intensity. Starting off gently, the morning shows a maximum of 1 at 07:00 and 08:00, ideal for early risers. As the clock strikes 09:00, it begins to rise to 2, and by 10:00, it reaches a moderate 5. The real heat kicks in at 11:00 with a peak of 7, and then surges to an intense 10 at noon. The highest point occurs at 13:00, where the UV Index peaks at an impressive 12, urging everyone to seek shade and wear sunscreen. Gradually, it starts to decline; from 11 at 14:00 to 10 at 15:00. The afternoon cools down with readings of 7 at 16:00, falling to 5 by 17:00. As evening approaches, the UV Index dips to 2 at 18:00 and settles back to a safe 1 by 19:00. A great reminder to respect the sun during its potent hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV levels exhibit significant seasonal changes. January sees a moderate UV Index of 5, while February and March jump to 8 and 9, respectively, indicating very high exposure risks with short burn times of just 15 minutes. The peak months for UV exposure are from April to August, where the Index reaches an extreme level of 11 to 12, necessitating caution with a burn time of only 10 minutes. As the year progresses, UV levels decrease, but October remains notably high at 9, followed by November with a high category of 7. For visitors and residents alike, it is crucial to take protective measures during the high-risk months of April through September and remain vigilant, using sunscreen, wearing protective clothing, and seeking shade to minimize the risk of skin damage.
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 |
| 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 |
| Redwood | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 12 | 11 | 9 | 7 | 5 |