Last updated: July 2, 2025
In Williamson, United States, being aware of the UV Index is crucial for maintaining your skin health and preventing sunburn. Understanding UV levels helps you take proactive measures to protect yourself from harmful radiation, especially during peak sunlight hours. With Williamson’s Cfa climate, which features warm summers and moderate UV exposure, the risk of skin damage can be significant when the UV Index climbs, reaching a high of 11 around midday. By keeping an eye on the UV Index, you can enjoy the outdoors while safeguarding your skin from the sun’s potentially damaging effects.
The UV Index throughout the day showcases an intriguing pattern of intensity. Starting low at 07:00 and 08:00, with a manageable score of 1, the sun's rays gradually intensify. By 09:00, the index climbs to 3, hinting at a warmer day ahead. The peak arrives at noon, hitting a striking 9, and just a little later, the UVI reaches its zenith at 13:00 and 14:00, both at an impressive 11. As the afternoon progresses, the UV exposure starts to wane, dipping to 9 at 15:00 and further decreasing to 5 by 17:00. The evening cools down significantly, with the index returning to the comfortable levels of 3 at 18:00 and finally resting at 1 by 19:00. Stay protected and enjoy the sun, especially during those peak hours!
| 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 | 11 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 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 significant seasonal variation, peaking during the summer months. January and December see a moderate UV Index of 3, allowing for a burn time of 30 minutes. However, by February, the UV risk escalates to high with an index of 6, and this trend continues through March (UV Index 7) and April (UV Index 9), which are also considered high-risk months. The months of May to September present the highest UV exposure, with a very high index of 10 in May, June, and August, and an extreme rating of 11 in July, where the burn time shortens to just 10 minutes. October begins to see a reduction with a high UV Index of 7, followed by a moderate index of 5 in November. Given these fluctuations, it is advisable for both visitors and residents to take necessary sun protection measures, particularly from late spring through early fall, when UV exposure is most intense. Wearing protective clothing, applying sunscreen, and seeking shade during peak hours can help mitigate the risks associated with high UV 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 |
| Williamson | 3 | 6 | 7 | 9 | 10 | 10 | 11 | 10 | 9 | 7 | 5 | 3 |
| 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 |