Last updated: June 2, 2025
Understanding the UV Index in Dayton, United States, is crucial for maintaining your skin health and preventing sunburn, especially during the warmer months. With Dayton's BSk climate, residents and visitors face unique UV exposure risks that can vary throughout the day. For instance, UV levels peak around noon, reaching an intense 11 on the index, highlighting the importance of awareness and protective measures during those hours. By grasping the significance of these UV levels, you can enjoy outdoor activities while safeguarding your skin against potential damage.
As the day unfolds, the UV Index rises steadily, peaking at 11 around 1 PM—a clear signal for sun protection. Starting from a low of just 1 at 7 AM, it escalates through the morning, hitting 8 by 11 AM. At 12 PM, the intensity reaches a significant 10, before slightly diminishing to 9 at 3 PM and tapering off rapidly in the afternoon. As the sun begins to set, the UV levels drop to 4 by 5 PM, finally settling back to 1 by 7 PM. With this clear UV trajectory, staying cautious during the peak hours, especially from 11 AM to 2 PM, is essential for skin safety. Don your sunscreen and enjoy the sun responsibly!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 9 | 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 fluctuates significantly, reflecting seasonal changes in sun exposure. January and February mark the lower end of the UV spectrum with a moderate index of 3 and 5, allowing for burn times of 30 minutes. However, as spring approaches, UV exposure intensifies, reaching 6 in March and escalating to a very high UV Index of 9 in both April and May, decreasing burn time to 15 minutes. The peak UV Index occurs in June at an extreme level of 11, where minimal exposure can lead to sunburn in as little as 10 minutes. This high risk continues into July and August with an index of 10 and 9, respectively. September sees a slight decline to an index of 8, while October and November return to a moderate index of 5 and 3, allowing longer burn times of 30 minutes. Finally, December presents a low UV Index of 2, with a burn time of 45 minutes. Visitors and residents are strongly advised to take precautions during the high-risk months of April through September, ensuring they use proper sunscreen, wear protective clothing, and seek shade to avoid adverse effects from sun exposure.
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 |
| Dayton | 3 | 5 | 6 | 9 | 9 | 11 | 10 | 10 | 8 | 5 | 3 | 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 |