Last updated: June 2, 2025
Understanding the UV Index is essential for residents and visitors in Jacksonville, Florida, where the warm, humid climate leads to significant sun exposure year-round. Awareness of UV levels not only helps prevent painful sunburns but also plays a vital role in maintaining long-term skin health. With peak UV readings often reaching as high as 11 during midday, it’s crucial to stay informed about daily UV levels to safeguard your skin from harmful radiation while enjoying Jacksonville's beautiful beaches and outdoor activities. Making sun safety a priority can ensure your time under the Florida sun is both enjoyable and healthy.
The UV Index throughout the day paints a vivid picture of the sun’s intensity. Starting at 07:00, the day begins with a gentle UVI of 1, perfect for early risers. As the sun climbs, by 09:00, it ramps up to 5, shifting gears towards midday. The intensity peaks at 12:00 and 13:00, hitting a formidable 11—a clear signal to protect your skin. The afternoon sun gradually mellows, dropping to 10 at 14:00, and then steadily decreases to 3 by 17:00. As twilight approaches, the UVI recedes to 1 by 18:00, marking a tranquil end to the day. Staying informed about these fluctuations can help ensure a safe and enjoyable experience in the sun!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As the year progresses, UV exposure levels exhibit significant seasonal changes, with the highest risk occurring from March to October. During these months, the UV Index peaks at 11, classified as extreme, particularly from May to July, where the risk of skin damage is at its greatest, with a burn time of just 10 minutes. Visitors and residents should remain vigilant, particularly from February to October, when the UV Index frequently hits high to very high levels. It is advisable to wear protective clothing, apply sunscreen regularly, and seek shade, especially during peak daytime hours. Meanwhile, the lowest risk months are January and December, where the UV Index drops back to a moderate level, allowing for a more comfortable outdoor experience. Staying informed and proactive about UV exposure is essential for skin protection year-round.
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 | 11 | 10 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |