Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Thomas, United States, as it provides essential information about ultraviolet radiation levels that can impact your skin health. With the potential for sunburn and long-term skin damage, being aware of daily UV levels is vital, especially during the hottest hours. Thomas, situated in a Cfa climate zone, experiences varying UV exposure throughout the day, with peak levels reaching as high as 12 around midday. By familiarizing yourself with the UV Index, you can take the necessary precautions to enjoy the sun safely while protecting your skin year-round.
At sunrise, the UV Index sits comfortably at 1, gradually rising as the day unfolds. By 09:00, it reaches 3, signaling the start of increased sun exposure. The real heat kicks in by 10:00, soaring to 5, and peaks dramatically at 12:00 with an alarming 10. The zenith arrives at 13:00, hitting 11, followed closely by a high of 12 at 14:00—an essential reminder to seek shade and protect your skin. As daylight wanes, the UV Index declines, tapering off to 10 by 15:00, and returning to a more manageable 5 at 17:00. By the time the sun sets, it cools down to 3 at 18:00, and finally drops to 1 by 19:00, highlighting the critical hours to stay sun-safe during midday!
| 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 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index demonstrates notable seasonal changes, with the most intense exposure occurring from April to August. During these months, the UV Index reaches extreme levels (10-12), significantly reducing the burn time to just 10 minutes. March and September also pose risks with very high levels (8-10), allowing for a burn time of only 15 minutes. Consequently, February and October present high levels (6-7), where protective measures are still advised with adjusted burn times of 25 minutes. Residents and visitors should exercise caution and protect their skin, especially during the high-risk months of April through August, by using sunscreen, wearing protective clothing, and limiting sun exposure during peak hours.
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 |
| Thomas | 4 | 6 | 8 | 10 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |