Last updated: July 2, 2025
Understanding the UV Index in Dayton, United States is crucial for maintaining your skin health and preventing sunburn. With Dayton’s semi-arid climate (BSk), the region experiences varied UV exposure, particularly during the peak hours of 10 AM to 2 PM when the UV Index can soar to 10, indicating a very high risk of harm from unprotected sun exposure. Knowing the daily UV levels helps residents and visitors alike take necessary precautions, ensuring they enjoy outdoor activities while safeguarding their skin. Stay informed, stay safe, and embrace the sun wisely in Dayton!
The UV Index on this particular day paints a striking picture of sun intensity as it unfolds throughout the hours. Starting with a gentle maximum of 1 at 07:00, the sun gradually rises, peaking to a significant 10 by midday at 12:00, signaling the height of solar radiation. This intensity remains unwavering at 10 from 13:00 to 14:00, providing a bold reminder to stay sun-safe. As the day progresses, the UV Index begins to retreat, dipping to 8 at 15:00, and continuing its descent to a milder 1 by 19:00. Whether lounging outdoors or engaging in activities, it's essential to be mindful of these fluctuations and adequately protect your skin during those peak hours!
| 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 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 10 | 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 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 |