Last updated: July 2, 2025
Living in Jacksonville, United States, it's crucial to stay informed about the UV Index and its implications for your health. High UV levels can cause sunburns and long-term skin damage, making awareness essential for protecting yourself and your loved ones. Jacksonville's Cfa climate brings warm, sunny weather year-round, but this also means increased sun exposure, particularly during midday hours when the UV Index peaks at a striking 12. By understanding the UV levels throughout the day, you can take proactive measures to enjoy the sunshine safely while safeguarding your skin health.
The UV Index on this particular day reveals a dynamic shift in sun exposure as the hours progress. Starting off at a mild 1 at 07:00, it remains low until 09:00, when it begins to rise gradually. By 10:00, the index reaches 5, signaling the start of heightened UV radiation. The day peaks sharply at 12:00 with a breathtaking 10, and just one hour later, it hits its maximum at 13:00 with an impressive 12. As the afternoon continues, the UV levels begin to decline, dropping to 11 at 14:00, and further decreasing to 9 by 15:00. The evening hours offer a welcome respite as the index falls to 4 at 17:00, then down to 2 by 18:00, and finally returning to a low 1 by 19:00. It's a vivid reminder to stay protected 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 | 8 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV levels fluctuate significantly, with the highest risk occurring during the summer months. Notably, from May to August, the UV Index reaches extreme levels (11-12), where the burn time decreases to just 10 minutes, warranting heightened caution. March and April also present high risk with very high categories (8-10) and burn times of 15 minutes. The high-risk months for UV exposure are therefore March through August, requiring visitors and residents to take preventive measures such as wearing protective clothing, applying sunscreen regularly, and seeking shade, especially during peak hours. In contrast, January, February, November, and December experience lower UV levels with moderate to high exposure categories, offering some respite, yet protective measures are still recommended on sunnier days. Stay informed and stay safe under the sun!
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 |
| Jacksonville | 4 | 7 | 8 | 10 | 11 | 11 | 12 | 11 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |